I am in a different position than the OP, but I was looking at similar, mainly about trading in my half-ton in for a daily driver the same length.
The 2016 Ford F-250 was about the same price as a F-350... but it didn't have the capacity to haul the truck camper I want to get, unless I went with two wheel drive, and it would be cutting things close. Someone farts, vehicle would be overloaded.
The 2016 Ford F-350, configured with a gasser engine, short-bed, extended cab, which would be about 17 feet in length would be the ideal for my needs. It would do 4250 pounds at most... but good enough.
Everything else, this model year, is the same, except for the springs and weight ratings. However, since my insurance company knows how much my truck can carry, and knows the weight of any truck camper (or can easily look it up), I always error on the weight police side to be safe.
The main reason for a gasser -- my commute is urban, and gas is a lot easier to find than diesel, especially at most places where the diesel pumps are the edge spots... which are the first taken. Plus, when hauling gasoline, the same fuel can be used in the truck's tank or the portable generator's.