So last fall I bought a 15 F350 in great shape with low miles with the 6.2 gas. Of course the salesman said "oh yeah, it will pull anything a diesel will" So, I just bought a new Montana High Country 34 ft. 5th wheel. I live in NW Wyoming and plan on pulling camper (with a trailer behind with side by side on it) . Most of my trips will be within two hours but many mountain climbs. How will this gasser handle it? When you search for 6.2 versus diesel on here, you get a lot of 6.2 fans......all thoughts appreciated

 

It's all about the torque. You always hear about HP, doesn't matter much when towing, especially uphill, it's the torque.
6.2 gasser 405 lb/ft @ 4500 rpm hp rating - 385 @ 5500 rpm
6.7 diesel 860 lb/ft @ 1600 rpm hp rating - 440 @ 2800 rpm

The 6.2 is "adequate" but can't touch the 6.7, plus the fuel economy is much better on the 6.7.

Just sayn'

 

2018 6.7

450/935.

 

Torque along with gearing will help keep your engine in that "SWEET" spot when towing. Cuts down on excessive shifting (even when using Tow/Haul mode). What gears does the truck have? The 6.2 will be running at 3X the RPMs as the diesel to get 1/2 the torque the diesel produces.