We got our Everest new in 2003. I don't think I would want to spend much time in it in cold weather even though it has a completely insulated underbelly. We've been in the high teens to mid 20s with it for short periods - less than two weeks - and it's very hard to keep warm. On the other hand the single 15K A/C has always kept it cool even out west in some summer months.
Other than that we still have it because we like it and have installed many upgrades to make it more comfortable to live in.
Pix taken at Whit's End CG - NH - 2010On edit: I just noticed you have a 2500 truck. Our pin weight is always around 2500# - 2700#.
FastEagle