M800 series (formerly M54) 5T used a ten bolt split rim, the M900 1st series also had split rims, the M900 A2's used 10 bolt Combat rim (both in 20", differing widths) (And MRAPS and LTMV's) but thee later series all seem to be singles without a capability of duals, therefore holes would have to be enlarged.
hence my question on possibility.
7 good M800 tires (one for spare) would be relatively cheap as owners typically swap them out for later M900 super singles. Rims for the M900A2 series average $50 each sometimes....(Aberdeen was $40, but it turned out to be an MRAP rim)
Just worried about frame/hull rubbing during turning, and with the slpit rim, possibility of slippage on the rims. The m900's have a 1" thick x 9" wide? large rubber insert which when fitted and bolted down acts as a bead lock so the deflated tire can stay put on the rim. No crude screws like some 4x4 users use or metal spreaders like some WWII vehicles had to try and fit (most rusted away now)
So if I wanted a more modern upgrade, 9:00 x 20 tires (rubber) from M35 Deuce with splits from M54, M800, M900 basic truck or upgrade to Combat rims with M900A2 /MRAP or LMTV series era but truthfully they may have to be carved down on a lathe and rewelded to 9:00 tire width, which isn't an impossible task for even a small machine shop.
M800 (formerly M54 series with added hood/fenders and changed motor)
(but upon inspection I think the main lug holes need to be widened as they are not setup for Dual application, just regular BUDD Studs
M900A1 runs split rims....
(but the holes for the lugs are set up for duals)
LMTV Combat Rims with more bolts
MRAP Tire (I think the holes would have to be widened)
MRAP again Combat rims with plenty of bolts and all these are now surplusing out fairly cheap, can't have the truck, but the rims are sold off by the pallet. Again the holes for lugs may have to be widened, unlike Dual wheel setups like the earlier 5T trucks
Early DUKW (on spilt rims too, which would mean a 5T from M54/M800/M900early rims would be fine here (width still needs checking)
Standardized DUKW Rims w 18" wheels
Just some stray thoughts.