Fold down rear seat vs body stiffness

A mini tub on a fold down car would be a little interesting. I actually think the rear seat would be the easiest part of it, the brackets that locate the rear seat are basically "flush" with the outside of the wheel house. You'd have to make new mounts, but I think the seat could actually stay in the same place. As far as the seat mounting brackets and latches, they're easy. If it isn't totally obvious from my pictures, I converted my standard Duster to a fold down seat. Locating the mounts and latches isn't all that bad since you know where the seat goes.

But the pass through panel would have to be cut down, the reinforcing panels moved, the and the rear fold down panel would have to be cut down.The finish panels wouldn't fit at all, you'd either have to cut off the section that's visible next to the fold down seat or ditch them entirely. And the end result would be a pass through area that would be really small- not all that useful. It'd be a lot of work, and after all of it the advantage of having the fold down seat would pretty much be gone.

With a Duster you can run 275 wide tires without moving anything with the proper backspace. I test fit a set of 275/40/17's on my Duster on a set of 17x9's with about 4.75" of backspace, stock axle and spring location. They were tight, but they would work. With a set of offset hangers/shackles I'd bet you could fit a 285 wide tire. Keep in mind that's for a lowered car, with the wheels entirely within the wheel wells.