I think this is very smart and I believe most people would agree with you. After I had posted that, I began to wonder if purchasing a new truck would be the best use of that money. I think investing fairly conservative would yield a 6% return where its fairly common to get very low interest auto loans of new vehicles. A lot of food for thought with purchasing the camper. Ill have to give that a lot of thought.
Since you indicated your employer can cancel your company retirement account, I would definately get that money into another account where only you can touch it. Then, follow the advice of the previous poster and perhaps make payments at low to zero interest on the truck. Having a warranty on a new truck (or nearly new) is peace of mind and should something happen you might be out some time but rarely significant money. And since some manufacturers warrany new trucks up to five years on the engine you should be good to go for at least half your anticipated ten years of full timing.