First time restoration early 60's C60 dump -getting myself into trouble?

[CrosbyFamilyFarm]

So I'm trying to buy a 1960 C60 dump 292 inline 6 that reportedly was parked 5 years ago when it ran and dumped. He says he always had some trouble with 1st gear but just started in 2nd. Other than that I don't have much information. Engine looks OK and the frame isn't super rusted.

I'd like to get this running and street worthy. I have little knowledge about these trucks, which is a big part of why I'm picking it up, but I'd like to know some common pitfalls with restorations with them. Parts seem relatively available, true? How worried should I be about either fixing the transmission or getting a replacement?

Also, I need it towed to my house - any ideas on the weight so I can tell the tow company?