I just spent 10 min. googling HMMWV tires being used off road......
The only thing good I found posted about them was that they were cheap.
No one liked 'em off road.
No one liked 'em on road unless they were aired down to 20 psi and at that they were "squirrely" on the road.
Many complained about the weight of 'em (10 plies???

)
Many complained about very early onset of dry-rot
I didn't find anyone having mounted them on anything less than a 1/2 ton truck.
The guy that ClarkPeach got his rig from had those HMMWV tires and custom Hummer bead locks..... he went to sell the set of 7 tires and 4 wheels and it took FOREVER to sell 'em.
I'd call that fairly good reason to believe they're not a good choice..... they certainly aren't one of those "best kept secrets" for tire awesomeness......