What's do I lose???

[hartbraker]

I'm the first guy to sit here and say bigger is better, but to claim that the op desired setup won't safely haul and do what he wants to do is a bit absurd. The trailer weight is sitting on wheels. Most trailers are set up for 70/30 weight distribution, 70% of the load remaining with the trailer... so he's just dragging it along for the ride. But while we're on the engineering side of things, you can go ahead a double whatever the gvw the truck was rated for because everything was, is, and will be over engineered when it comes to auto related items due to the unknown and sudden change nature involved with vehicles.

Sure, I'd never do what you're planning to do, but I wouldn't feel uncomfortable jumping in your setup and driving it down the road with a loaded cab and car hauler. Stuff will be lighter duty, and will require much more frequent maintenance. Bearings in axles will wear out faster, upper and lower ball joints... I'd even go as far to say that your transmission and gear oil will get hotter than normal and should require a more watchful eye. But, build it how you want it... it'll do exactly what you want it to do... it'll just cost you more in the long run to have to look you desire. But that's the name of the game everyone on this site is playing. Gotta pay to play