Are those the stock wheels? You mentioned getting military tires. Military and the LT tires people put on their M416 are very stiff and bounce. Even when aired down. I found out the hard way . I went with older CJ Jeep wheels and a 15 " tire. The trailer behave much better off road .
For what it's worth I have two 416 wheels F/S.
Honestly I dont have a clue if they are original or not. The hubs appear to have a spacer in them and both sides have regular lug bolts on them vs one side having opposite threading lugs (and the lugs are long as hell).