2 one owner GMC 5500 grain trucks

[70c10-08]

I have very little info on these except a local farmer walked into the very small and long defunct Crossroads GMC here in town and purchased 2 GMC 5500 grain trucks both have v8's CE503Z137850 is one's vin and CE503Z153762 is the others how much would they be worth? what do the vin's say about these? besides for the fender flare rot that's all that I can see is wrong rust wise one is 2 tone blue and white and her sister is just all blue