Cross country stuff, dirt roads, but no rock crawling.
My bought an axle and 35" tires with wheels from a friend that were on his M416 trailer, so it should be easy to put them under this trailer with some minor grinding/welding.
From the ad:
Overall length is 8', 1000# gvwr. The main box is 6' x 3', the tongue box is a tapered enclosed box w/ a locking hasp, the main box has a secured from inside tailgate.