I think on a road trip is where you'd notice the difference. Your legs (or your passenger's legs) wouldn't have as much to support them. I think the reason you don't notice it in the extended cab is because you can't extend your legs if you wanted to.
I used the 88-98 Chevy fullsize bench and in the rear-most position (the one that it'll always be in when I drive) it does not rub the doors, clears by about 3/4" per side. If I slide it forward, it will rub the doors.
