My vote: Dodge Power Wagon. Period. Quite simply-NO other truck offers what the PW does, bone stock. Need more carrying capacity, install stiffer leafs (on the 2005-2014), stiffer coils on the 2015+. Easy peasy. I put Hellwig Load Pro 35's on my 2008 Power Wagon w/G-56 6-speed manual. I tow a 10,500 lb Toy Hauler w/1500 lb tongue weight. No issues at all. Been doing that since 2008. Dodge frames are wicked strong. I have had a 1200 lb atv in the bed (2003 Bombardier Traxter Max 500 w/28" 589 tractor tires, winch & loaded front & rear racks with gear) & flexed it till a tire came off the ground (w/swaybar disconnected) & the space between the bed & the cab stayed the same as sitting on flat ground. A Hemi will never be a diesel, but the Power Wagon i have at least, has never run out of power. My crawl ratio w/G-56 is 78:1. Lower than a stock rubicon with a manual, rock-trac 4:1 trans-case & 4,10's.
Do your research & pick what best suits your needs. If you succeed, you will have a smile on your face, like i do, when i drive my wagon. (no smile when putting gas in it though !!! LOL) Mine does suck gas. 8-10 mpg. Empty or pulling 10,500 lbs. Still 8-10 mpg. No lift, stock 33" tall tires.