The rust can be repaired fairly easy and for 2200 bucks it's the best deal. The others are over priced...way over! I just (cheaply)bought a one owner D200 this week and waiting on it to be delivered Saturday. It will the new tow truck for my '78 Chrysler Conqueror boat.

Why are you narrowing your search to early 70s trucks? oh.. that's right. They are cheaper to maintain. Are you sure about that?
There are good trucks and good deals to be found if your patient enough. What about 1990's Cummins diesels?