Ok, Colorado member sounding off. Never been there, but the educated guess is that all of these came from Carson or Ft Riley. My truck is a Riley truck, and love it, I bought it from a private seller who just flipped it. I paid double the auction. It's not the price, it's the condition, which is sometimes hard to assess, particularly from pictures. Ranchers looks like a pull it from GP and flip it. People need to make money somehow. I've been in and out of tons of Riley trucks from the KS salvage yard, some are great, some are horrible. All of our trucks needed something. Best way is to go check it out with a buddy, and then see if you can get specific info on it, then drive and review the truck inside and out. Check all the fluids (detailed) like the radiator not just the overflow. Mine was great, 80% of the members have brown crud. Not a 5 min grinning like an idiot because it's a 5 ton either, real hard inspection. You probably won't know your truck until 3 months in when the bugs are out of it. Assume any truck off GP will take $1000 just to get it in running condition, and that's just fluids and fixing the small obvious things like bulbs and wiring, let alone the cool ideas you have to make it your own style. Ramblings aside, if you are serious about the Ranchers one, I could make a side trip with you to check it out. It's 3+ hours away from me.
So, GP auction will be cheaper, but the recovery can sometimes set you back and most people have no idea what they are buying, that's the thrill of the auction and the surprise. How many people actually get to inspect their truck beyond pictures from a laptop afar. One member got 1 block before his engine blew from the GP lot. No warrantee, no feeling bad from GP, he got boned. A private seller can allow you to inspect and probably can tell you what is wrong with it so far, and remember just because they are listing it, doesn't mean they won't negotiate prices. Try that with GP. They might even do some sort of warrantee if you ask.
Good luck, you'll find it though.