Learn what your vehicles can handle. Start by looking up your motorhome's towing capacity in the manufacturer's towing guide. Most RV's have a maximum towing capacity of 5,000 pounds but you should limit your car's weight to 3,000 pounds or less. The tow-ability of your car depends on its make and model, type of transmission and whether it's front, rear or all wheel drive. Check with the manufacturer to learn their requirements.