Not a bad idea at all you gots there !!!
I found one of them horse mineral feeders down at mines local Atwoods Farm and Ranch that hangs nicely over the gunnwell to perform the function of a tray. Cost 'bout 12 bucks and holds all mines favorite thangs. Thay gots two types .... be shore to git the hard plastic style and not the mo flimsey rubber one.
Well ~ There ya go ...... just a 'nuther hop tip from the boards of MMT !!!!
