Best vehicle w/3rd seat? Durango? Sub/Yukon?

[CWilliams]

Guys- I brought this post back up because I've decided on a suburban but have some questions. I really like the 2500 and like the thoughts of having all the towing/hauling capabilities I'll need. I tow a 20'camper, the '67 some and the '01 some with an open/tilt trailer. Concern is around using the 2500 as an everyday vehicle. Most 2500's I've found are '98-'99's, 4x4's with vortec 454's. What would be the difference in mpg between a 2500 vs. a 5.7l 1500 (prefer 2wd), What would I give up towing wise between a 1500? 2500 2WD's are harder to find, 1500 2wd's can be found easy. Thanks for your help.