As far as I could find the lightest TH with a separate garage is the Keystone Tail-gator 233rr at about 6500 - 7500 ibs. 7800 max. I have one and pull it with a stock Tahoe but it's all the Tahoe wants and I intend to move up to a larger truck. It's a hybrid with a folding bunk end in the front so it still has good room but as I've said I don't think a lifted truck will handle it safely. Here are some pics. They haven't made them for a while but it's a good TH if you can find one.
http://www.fixedsighttraining.com/Photo--Video-Gallery.html