Looking at a C65 Dump - new to larger trucks.

[CrosbyFamilyFarm]

So I've got enough work to do around the farm to need a dump truck. I know basics of mechanics but it would be a stretch for me to ever go into a transmission without someone on stand-by. That said I'm questioning whether to get a mason dump because I'm basically familiar with the mechanics of things or if I should go for someone like a 1978 C65 dump I saw on craigslist. I do need it to be able to drive on highways - not super long distances. Here's a link to one I was looking at: https://newhaven.craigslist.org/cto/...535279951.html

How different are things or are there any special concerns with this model or year? Are parts pretty available? Should I look for anything in particular before I check out a midsized dump? What's a fair price for a working model of this year (understanding that the person says it needs "some work").