A buddy had a 99, I6, 4wd. Always had computer problems, throwing codes, and the tranny took a dump. Have you considered the older tahoes? 88 up are a fairly good looking vehicle, and almost all parts are the same as the trucks. We had a 1993 burban with the 5.7, 4wd, and it got about 16 pulling a 4 place snowmobile trailer, 19 normal freeway. The 1500 chasis was a little light for pulling trailers, would have prefered the 2500, but since the tahoe is shorter, it sould probably ride better.