Big FWD's are usually lousy in the handling department, and I believe it would take a lot more sophisticated rear suspension than the average flatbed trailer has to make it safe to drive- - - -particularly when it's carrying some serious weight like a car or a pickup. The whole concept sounds like a rolling deathtrap to me. Just because a talented welder can graft something like that together doesn't necessarily mean it should be done, or will be safe when it's finished.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!