Enclosed trailer question

And why do the 1 tons usually have dualies? Ever see what happens when a rear tire let's go while towing that trailer? One of my best friends was towing his 24 footer with a 3/4 ton. Inside were two less than 1,000 lb formula race cars with some spares, chairs, scooter, etc. They left Chicago to attend the races at Road Atlanta. Fours hours into the trip a left rear truck tire let go (later deemed to be from a metal part puncture). Trailer started wiggling, then the whole this went out of control. Trailer went down the ditch, pulled the truck with. Crew cab Ford with dual fuel tanks, and four passengers. Shredded tire ripped out both fuel tank filler necks and tore off most of the quarter panel. Then the trailer pulled the truck into the ditch. Truck. trailer, and passengers all ended up on their side. No serious injuries but truck, trailer and race cars were wiped out. He has never towed without dualies again. One more tire would have saved the whole thing.