I went from a 2012 F150HD to F250 6.2. With our 9000lb 5th wheel, the F150HD handled it great and I preferred it over the F250. But I always had to watch what I loaded in front storage and could not use the bed for anything extra.
Never pulled a TT with the F250 but I didn't even like a moderately sized 26'TT behind the F150HD. We have a lot of open areas and seems like 20mph+ cross wind all the time. Nothing unstable but constant twitching. The 5th wheel solved that problem:)
No complaints about the 6.2, just the chassis/suspension/ride. The extra weight of the diesel may help there. The F150HD was rough but nothing like this.
If I was forced to tow a 35'TT, it would definitely be with a 3/4 ton and a good hitch.
