Well now that you brought it up I guess I'll wade in.
I went from diesels back to gas and so far have no regrets. In the past I have owned all of the big three diesels. I have had many Ford diesels including 3 7.3 diesels and one 6.0. the 6.0 was in a F550 that I used to use for pulling a 5th wheel and then hauling a pickup camper. It just always scared me to go some place thinking about this engine and having it quite on my someplace that had now idea how to repair it and just start throwing things at it at my expense.
So anyway I know have a F350 with the 6.2 gasser with the 6 speed auto and am very happy with it. I have towed my 5er that I use to own that had a GVWR of 12,000# and was happy with it towing that much weight. I now have the NL TC in my sugnature and it just purrs down the road without any problems. I average between 10.5 to 11.5 MPG hauling it. The real test well be when we go to Alaska this year.
As far as towing with camper on if the trailer isn't a big huge one I would have no problem towing with it as it has plenty of power. The 6.2 gasser has a trailer towing rate of almost 15000# with the 4.3 and the diesel has a towing rate of almost 16,000# in a SRW. My GCWR is 22,500# and I believe the diesel is 23,500# but some of this is going to be taken up by the diesel engine. My GVWR is 11,200# and the diesel is 11,500# so I have a higher payload than the same truck with a diesel. I towed my 17' boat with the camper on and it had no problem keeping up speed in 6th gear. I ordered my truck and ordered it with the 4.30 axle ratio. My truck is heavy also for a F350 SRW. It is a CC 4X4 King Ranch and it is loaded with options and it scales right at 8,000# with nothing in it. It does need to rev up for hills but that doesn't bother me. I use to live in CO and pulled the backside of Eisenhower tunnel from Dillon with a 72 F250 360 4 speed manual with a 11' TC on it. I would run up the pass as far as I could in 4th then shift to 3rd and then back off a little and let it run up the hill. We always made it. The 6.2 is a happy reving engine and likes to run up (it also sound nice reving up reminds me of my yester years with my old muscle cars). You need to take one of the new gassers for a drive.
This is IMO