Note;
Don't mean to be mean. Never have seen a " Winnie" with a Dual Rear Axle. Mine was the same general body style and it was a Chieftan/W/Single rear drive axle. 32foot!
Most units running Dual rear axles were a power Axle and a Trail axle and rear engined diesel powered. Such as a Prevost or Numar! There were others though .The very handsome but Poor quality G.M. and Dodge Motorhomes. Now AirStream had a unique one and I think you can still special order that puppy !