Many motorhome owners flat tow a vehicle (all four wheels on the ground) on their RV camping trips. We here at www.rv-camping.org flat tow our modified Jeep Wrangers on our adventures, and have for over 120,000 miles. We appreciate the freedom and convenience of having a small vehicle instead of using our RV to explore new places.
Towing anything is a pretty big responsibility in our opinion. State laws vary, but trailers over a certain weight require trailer brakes… typically 1500 lbs. While trailers are usually required to have braking systems, many state towing laws are vague at best as to a requirement for towed vehicle brakes. Some states require a stopping ability within a specified distance from a stated speed, and many require a "break-away" brake for situations where the towed vehicle becomes unhitched, but as far as we know, there is no national standard for supplemental braking systems in the USA.
Logically speaking, if state laws require a trailer of 1500 pounds to have brakes, it seems to us that towing something that can easily weigh twice as much (our Jeep weighs over three times as much at nearly 5000 lbs.) should have a braking system too. However not everyone agrees with the above logic, and there are a large number of folks out there towing a vehicle without supplemental brakes.
Read more here: http://www.rv-camping.org/towed_vehicle_supplemental_brakes/