I have seen lots of photos of RVs overturned on Facebook and almost immediately there is some know-it-all on there saying the truck wasn’t big enough for the rig. Doesn’t matter if the rig was a teardrop trailer going through 30mph wind…just need a bigger truck (said with a grunt) is always the “answer”. Well, it is not. It is, however, important to know your towing capacity.
Towing capacity is a series of calculations and a lot of safety margin, not a single number expressed in pounds. Whether you’re looking for a full-size truck to tow your boat or horse trailer, or one of the best towing SUVs to carry your family on vacation and pull the camper you’ll stay in, there are a series of terms and concepts you’ll need to understand to make the right decision.

What is Towing Capacity?
Your vehicle’s towing capacity is the maximum amount of weight it can safely pull, which changes based on how it’s configured, how much weight it’s already carrying, and how you distribute and control the load you need to tow.
There is a single number that automakers use to best estimate towing capacity. Still, it doesn’t give you a hard rule that works in every situation. Calculating it requires knowing several things about both your tow vehicle and the trailer you plan to tow.
While manufacturers will publish a towing capacity for each vehicle they build, it’s important to note that calculations assume that the tow vehicle is carrying only a driver. If you plan to tow a travel trailer and bring along your family and all the associated gear they’ll need for a weekend away, the manufacturer’s calculations will not be accurate for your load.

How to Calculate Towing Capacity
To calculate your vehicle’s towing capacity, you’ll need to know the full GCVWR — Gross Combined Vehicle Weight Rating — of the vehicle you plan to tow with and the trailer you plan to tow, together with all the cargo each will carry, from people to wiper fluid.
Then you’ll need to know your tow vehicle’s curb weight – the weight of the tow vehicle itself when filled with gas and all the other fluids it consumes while driving.
Subtracting the curb weight from the GCVWR gives you the vehicle’s towing capacity. Manufacturers will stress that you should never exceed your vehicle’s towing capacity. We would add that, for safety reasons, it’s best to never come within 10% of that total.
Loads shift. People miscalculate. Then, cars brake suddenly. For many reasons, driving a vehicle that strains at the absolute limits of its capability isn’t a good thing.

All the Terms You Need for Towing
Towing comes with its own lingo, which can be intimidating at first. But all the terms boil down to simple measurements, and there’s no need to memorize them — you can always look them up again here.

Towing Capacity

Your vehicle’s towing capacity is the maximum amount of weight it can safely pull.
GVWR
Gross Vehicle Weight Rating is the maximum amount of weight a vehicle can hold while sitting still. It takes into account the strength of the frame, suspension, axles, and wheels.
Your tow vehicle and the trailer you are using it to tow will each have their own GVWR. It’s possible to overload each one separately.
Your tow vehicle’s GVWR and its towing capacity are different numbers. The reason: The total weight the vehicle’s frame can support pushing down on it and the total weight it can withstand pulling horizontally on the frame through the tow hitch are different.
GTW
Gross Trailer Weight is the total weight of your trailer and its cargo. If you were to place the fully loaded trailer on a scale, the resulting measurement would be the GTW. If your GTW exceeds your vehicle’s towing capacity, you will not be able to move it safely. It is crucial that you never even attempt to tow a GTW higher than your towing capacity. While it might be technically possible to carry the load, you’re likely to damage the tow vehicle, the trailer, or both and be unable to control the vehicle properly.
GCVWR
Gross Combined Vehicle Weight Rating is the maximum weight of your tow vehicle and trailer combined, both loaded with all cargo. The tow vehicle and trailer each have their own separate GVWR numbers, which, combined, make up the GCWR.
GAWR
Gross Axle Weight Rating is the maximum amount of weight one axle can support. This number will almost always show differences between the front and rear axles. The two can be different materials or diameters, and few cars have a perfect 50-50 weight balance between the two axles.
Tongue Weight
Tongue Weight — sometimes referred to as TW — is the force pushing down on the trailer hitch by the load being hauled. Tongue weight can change based on how the load gets distributed within the trailer.

Curb Weight
Curb Weight is the total weight of a vehicle and all the fluids it requires to function (including a full tank of gas), but with no people or cargo inside it. Curb weight differs from GVWR, which is a measurement of how much a vehicle can carry.
Dry Weight
Dry weight is a measurement of how much a vehicle weighs with no cargo and none of the fluids it requires to function. Your tow vehicle’s dry weight is its weight when empty, without gasoline, oil, wiper fluid, or any other consumable. You don’t need to know your vehicle’s dry weight in most towing calculations.
Payload
Payload capacity is the maximum amount of weight a tow vehicle can carry in its cabin and bed. Payload capacity is the weight limit for a truck’s bed and cabin. In contrast, towing capacity is the weight limit for any trailer it can pull.

Trailer Hitch Classes
Once you know the various weights and capacities of your tow vehicle and trailer, you’re not done. The next step is to understand the device that connects them. Tow hitches operate with their own physical limits.
They get divided into five classes — read on to find out more.

1. Upgrading the Hitch
   The same vehicle can tow more with a Class III hitch than a Class II hitch. If your tow vehicle can accommodate the upgrade, stepping up in hitch class may get you the bump you need.
2. Installing a Weight-Distribution Hitch
   A weight-distribution hitch uses spring bars to help level the load a trailer places on your tow vehicle and reduce sway. This type of hitch is often the most cost-effective way of improving towing performance. It doesn’t require replacing any moving parts of the vehicle itself. This is the style I use here.
3. Upgrading the Brakes
   Braking power is often the limiting factor on the load a vehicle can handle. You might be able to step up affordably to larger brake pads and rotors.
4. Replacing the Axles
   Some RV shops can replace the standard axles that came with your tow vehicle for beefier versions built specifically for the demanding loads involved in hauling an RV.
5. Adding Bigger Radiator
   Towing is taxing on an engine. Improving your engine’s cooling capacity with a bigger radiator can enable it to pull more weight without causing undue wear and tear to powertrain parts.

How Do I Know What I Can Tow?
Unfortunately, it’s not easy to find the towing capacity of some vehicles. The amount of weight a vehicle can pull can be affected by its engine, transmission, and suspension. Most vehicles powerful enough to be used for towing heavy loads get offered with a selection of each of those components. Truck manufacturers also offer towing packages that can change axle ratios, and tire types and include factory-installed hitches.
Thankfully, many truck and SUV manufacturers today post a sticker on the driver’s door jamb that includes much of the necessary towing information, such as GVWR and GAWR.
You can find similar charts almost always inside your vehicle’s owner’s manual. But accurately reading them requires knowing which equipment package your car or truck has, which is not always clear when you’ve bought used.
Most truck and SUV manufacturers maintain websites that can provide that information based on your vehicle’s VIN, such as Ram’s Towing Calculator or the Toyota Vehicle Information Lookup tool.
Below, we list towing capacities for two typical examples of each class of car in a standard configuration this way:

Class/Vehicle: Towing Capacity

TIP: Towing capacity can vary widely within a class or even within a single model with several engines and transmission options. Check your owner’s manual to find the towing capacity of your vehicle.

Class I
Generally used for small and midsize cars and crossovers, Class I hitches can pull up to 2,000 pounds and generally withstand a tongue weight of 200 pounds. You might use a Class I hitch to carry a small cargo tray or pull a small tent camper or personal watercraft.
Class II
Generally used for large cars, crossovers, and minivans, Class II hitches can pull up to 3,500 pounds and withstand a tongue weight of 350 pounds. You might use a Class II hitch to tow a trailer carrying a small boat.
Class III
Generally used for full-size vans, trucks, and SUVs, Class III hitches can pull up to 5,000 pounds and withstand a tongue weight of 800 pounds. You might use a Class III hitch to tow a medium or midsize camper or boat.
Class IV
Generally used on full-size vans, trucks, and SUVs, Class IV hitches can pull up to 10,000 pounds and withstand a tongue weight of 1,200 pounds. They are the smallest class of hitch usable with loads heavy enough to require weight distribution. You might use a Class IV hitch to tow a large boat, larger camper, or utility trailer carrying a load of lawn equipment.
Class V
These hitches can pull up to 20,000 pounds and get used only with full-size trucks or SUVs specifically configured for towing heavy loads. Class V can withstand a tongue weight of up to 2,000 pounds. You might use a Class V hitch to tow a horse trailer or multi-car trailer.

How Much Towing Capacity Do I Need?
You need more towing capacity than the heaviest weight you plan to pull. Your tow vehicle must be capable of hauling its own weight, the weight of everyone and everything inside it, the weight of the trailer it’s pulling, and the weight of everything on the trailer.
It must be capable of pulling all of that weight combined and be equipped with a hitch that can do the same. And that load must be balanced, keeping in mind both the horizontal force required to move the load and the vertical weight that load places on the hitch and the assembly that mounts it to the vehicle’s frame.
There is no single chart that will tell you how much your specific load will weigh.
We’ll provide a rough guide to the weights, empty and full, of some common loads by trailer type this way:

How to Increase Towing Capacity
If you already own your tow vehicle and need an upgrade to haul more weight, check out these modifications you can make that might increase the load it can pull. But many are costly, change the day-to-day performance of your towing vehicle, and can limit its appeal on the secondhand market when it comes time to sell.
Check out these changes that can increase towing capacity:

How to Decrease Towing Capacity
Just as you can improve your tow vehicle’s performance under load with a few modifications, you can also reduce it. Be cautious of changes like:

1. Installing Bigger Wheels
   Larger aftermarket wheels might look cool or even improve your vehicle’s ground clearance. But they invalidate the manufacturer’s calculations of towing capacity. Larger tires require more engine torque and change the transmission’s shift points. These penalties may not show much when unladen, but they can dramatically lower a vehicle’s towing capacity in towing.
2. Changing the Tires
   You are likely to go through several sets of tires over the life of your tow vehicle. Be sure the tire vendor knows they are working on a tow vehicle. Low-resistance tires that improve gas mileage might sound like a good investment, but they can reduce the amount of weight a vehicle can pull.

What Other Technology Helps You Tow Safely?

Manufacturers of trucks began a competition of sorts with one another. In recent years, they have responded with some unique and valuable technologies that help make towing safer.
If you’re considering a new tow vehicle, some features you might consider include:
Ford Pro Trailer Backup Assist and Ram Trailer Reverse Steering Control: Like a second steering wheel for the trailer, these systems give you a knob that steers the trailer when you’re in reverse. Since backing up is often the worst part of towing, with the trailer turning opposite the tow vehicle, this can drastically reduce your frustration.

GMC and Chevy Towing Cameras: The Chevy Silverado and GMC Sierra are available with up to 15 different camera views, including a top-down view of the hitch to help in positioning and a “transparent trailer” setting that shows you the rear view unencumbered by the load you’re towing.