Surge breaks on a dolly

Class A motorhomes come in a vast range of weights and braking abilities. A small 12000 lb motorhome towing 4000 lbs of unbraked load will take a lot longer to stop. On a 50000 lb tandem axle motorhome, the weight difference and the stopping distance difference will be much less. It's never a bad idea to have brakes on the towed load, but it becomes a much better idea as the weight differential increases.