James, for what it's worth,
James, for what it's worth, if you love your truck and you own it you should be good to go and happy. We're in the same boat. I'm retiring and wanted a diesel 6 to pull my RV around. From everything I've read, and it's a lot, the Ford diesel is just old technology so it doesn't get anywhere near the MPG of the Ram or Chevy, and since it's pretty close to the MPG of Ford's own 3.5 Turbo, which costs less and you don't have to spend the extra for diesel fuel, DEF etc.,. it couldn't compete with their own engine offerings, so simply didn’t sell as the motor of choice when you wanted an F-150 unless you were a die hard diesel guy. No major problems with the engine that I've heard of, the 6.0L had some, but not the 3.0L that I’ve found. Nothing like the 1st generation Ram EcoBoost, which ended in legal battles. Today, I'd probably look hard at a Ram, since RVing is more fun in their way more comfy cab. The Ram engine and transmission now look pretty bullet proof, but like all Fiat's the door handles will fall off, and the electronics can be a nightmare. Chevy really needs a face lift, but their diesel is amazing. Both of those get way better MPG than Ford's diesel—but I can’t see it’s worth trading out if you love your Ford. I'm personally waiting for the hybrid, to see how that pans out, but likely will take my chances with the Ram. I'd seriously consider a Tundra, but they put their new models off until 2022 and retirement won't wait. Enjoy your retirement!!