Backspacing issue with whatever rims he was using? Maybe instead of making spacers for the rims to go over the studs he put the flange in front of the drums to create the space required. I suppose a fair amount of strength would be sacrificed on the axles as the engagement into the differential would be less. Best BS I can think of at the moment. 
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3RD Echelon Wksp
1968 M274A5 Mule Baifield USMC
1966 M274A2 Mule BMY USMC
1966 M274A2 Mule BMY USMC
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1943 Converto Airborne Trailer
1983 M1009 CUCV
1957 Triumph TRW 500cc
RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......
OMVA, MVPA, G503, Steel Soldiers
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