I've got a 4 door 3/4 ton pick up (GM) and knowing how the SUV's get built, the back seat of my truck is no smaller than it would be if it were a Suburban. My dad has a similar truck, but a Dodge and the back seat is a tad smaller. Both are diesels and both are very comfortable and if they can't tow it, I suspect it was intended to stay put.

If you go w/ a pick up, you can get just about any combination of motor & trans that you like, same with bed length.