What do you all think a 2007 GMC 2500hd Classic SLT extended cab LBZ with 81,000 miles purchased new by an elderly gentleman would be worth? It has recent Classic Tube stainless brake/fuel lines installed and BF Goodrich All terrain KO2 tires as well as 7'6" fisher minute mount plow used for non commercial purposes. It has the usual New England rust scaling on frame and some minor surface rust on inside of doors. Only pulled a trailer with a 2500 pound Kabota tractor. Rims need to be replaced as the clear coat is badly corroded. Thanks in advance!