true, we do motorkhana days on our stretched tyre fitment wheels, granted its flat, smooth ground so no need to worry about ripple strips etc, but there's still suspension travel and pressure distribution on tyres. Never really had an issue. I've got 215's on an 8.5 and 225's on a 9.5, which is just a moderate stretch, just gives me enough of a stretch to tuck in under a rolled guard. As for spring rates, I've got 10 in front and 8 in back, so there's not much travel. That said, its not exactly a comfy road car.