Ky x driver

Just a newbie who bought a farm wagon built on an old Mack truck frame. It has 20 inch Dayton style wheels. Eight spoke hubs with 4 lug nuts per hub. Single rear wheels. The 3rd member has been removed from the rear end. It has mechanical brakes which still work . Depending on the cab configuration it may accept a 10-12 ft. bed. Any ideas what model this was? I'm guessing 30s but have no clue. Also has all 4 small Mack hub caps