Sorry to be the bearer of bad news but, unless Silver Wheels has changed its policies, goodluck with your halftrack....
This issue has been hashed to death here on MLU, more related to universal carriers in the past, to no avail.
I have been there, done that with my M9A1 International halftrack I used to own. Why do I not own it now? 
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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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