CBR, I work for a GMC dealer and have driven the Denali /Sierra pickups with the quad steering. My service bay is in the tight area of the shop and I have to do a three point or so to get the bigger trucks on the lift. With the 4whl steering right on in!!! If you get to drive one take it to a lot and do a full circle in 2 whl steering then do it again in 4whl steering!!!! Huge difference. Haven't had any problems with these units!!!
Hope this helps!!!