Your F150 may not of had the right gearing to pull the mountain roads. My Chevy 3500HD has the 4.10 gears with 375/70/18 BFG All Terrains and does great in the mountains. I went 1 size larger with the tires that saved money on the BFG All terrains. The OEM tires were 265/70/18 and cost $70+ per tire.
It has the 6.0 V8 and is very quiet but you should do your research on engines and decide. The 3500 was not much more but the diesel adds a lot more.
I did not purchase the extended warrenty to save money and it is a WT (work truck) no frills.
Got the Torklift Tie Downs and they bolted up solid but come close to the front jacks footings but not a problem.