Thanks for the offer, another member helped me out via PM. It doesn't look like they had any bracket tying the main rectangular winch "box" into the sides rails of the trucks frame.
1975 Chevy K20 8400lb GVW Camper Special
1971 Gladiator J2000 Platform-Stake Dump 350/T18
1970 Gladiator J3000 3407Z Camper Truck 350/T18
1968 Wagoneer Custom 327/TH400
1963 Gladiator J300 Townside 350/TH400