We have a 2004 Durango 4x4 with 5.7L hemi and love it! Rides and handles great although the original stock shocks weren't the best. We towed a 5000lb TT for quite a few years much of which was in steep mountainous terrain. Now has 130,000 miles on it and looks and drives great. We bought it because there aren't many other mid sized SUV's with as stiff of frame and live axles that help with towing.
Sounds like you want something with a bigger engine and possibly a 3/4 or 1 ton. A full sized truck isn't an option?