Two years away and your looking at a truck that by your own admission will have around 150K on the clock? Why???
Right now is a great time to buy a new truck and have it paid off before you retire. Or, at the very least buy one newer with much lower miles on it. Remember when you retire your income will drop like a rock, meaning its going to be much harder to pay for a truck then. So pay it off now and plan to keep it until you quit traveling.
You can find deals. Ram trucks places like Dave Smith, and Dennis Dillon deal aggressively. Im sure there are dealers doing the same for both Ford and GM.