I never jack my truck up to change the oil. i just slide a pan under there, reach under and undo the bolt, then while thats draining I change the filter. All your gotta do is watch for the hot exhaust.
I have cranked the t-bars only bout 1.5" in front, and I have some mud terrains (285/75/16) so i assume it sits just a lil bit higher, but not much.
Oh and I'm 6', 207 lbs and I can still squeeze under it. Its a waste of time to get out the jack and stands for me...