I've got several Loadmaster trucks. We identify "Loadmaster" as a 1 1/2 ton or larger AD series truck around here. As far as prices go, anything is reasonable. I can quote you what I paid for four of my Loadmasters. The first 1948 1 1/2 ton was free, the second cost me $750.00 and I drove it home. The third cost me $650.00 and the fourth $500 and they all run and drive. With the cost of scrap metal now days, they may be worth a little more but the big trucks are still cheap to play with. No ones going to make any money fixing one up to sell though.
Look in the swapmeet/forsale ads. There's people wanting $2500+ for a decent looking trucks and they're not getting a single inquiry about them.
To better answer your questions, we would like to see what we're talking about. Post some pictures showing it's condition and we can do a better job assessing the truck for you. The year, equipment, condition, appearance, size/wheelbase, etc. all play a factor in a trucks value. Obviously, a wrecker bodied truck would be worth more than a stakebed, etc.
Welcome to the 'Bolt Morton!
Scott