You talking to me?
I know I won't win this one but I will stand by what I said. I do think a Toyota Tundra, Nissan Titan or GM with a 6.0l would make a great tow rig. IMO too many people like their big diesels and nobody wants to admit a lesser gas tow rig will do the job of towing their rockcrawler in similar fashion.
Yes, a gas powered truck is not as fast as a diesel... if you're hauling a huge trailer & 2 rigs a diesel truck is much better.
Expense of general maint? Gas truck wins.
Expense of replacement parts? Gas truck wins.
Expense of fuel? Gas truck wins.
Dodge & Ford autos won't last behind a turned up diesel. Either be alright with paying $5k to build a stronger transmission or deal with shifting.
We'll use new vehicle comparisons, since that's the latest & greatest.
Toyota Tundra specs- 5.7l V8, 401 ft/lbs & 381 HP. 8000# tow capacity.
Nissan Titian specs- 5.6l V8, 379 ft/lbs & 305 HP. 6500# tow capacity.
GM/Chevy truck specs- 6.0l V8, 373 FT/LBS, 353 HP, 10,500# tow capacity
Lastly... I'm cheap. I want a truck I can just get in, drive and not worry about expensive repairs. Before our last Dodge I was a huge Dodge diesel fan. After... I won't own another Dodge diesel. Don't care for Fords. A GM with a Duramax would be cool, but they get pretty poor mileage for a diesel. Might as well drive a gas truck with a big V8 and pay less for fuel.
All my ranting is in reference to towing a rockcrawler that weighs about the average of 4,500 pounds. Add a 1,500 pound trailer for 6k total. If you're towing some massive pig on Rockwells and a backhoe trailer or 2 rigs at a time, a gas truck may not be the best choice.