Nice size! Your going to be able to fit a lot of gear in that trailer. I'm looking to either build something like that or end up getting me a fiberglass M416 tube from dinoot trailers, it's about 48" wide by 6' long. I should be able to carry enough to gear Maybe add a water tank etc. etc.Not sure how big is the m101?? . The outside Demensions of the box are 90"x59" plus 8" of fender on both sides. The tongue is close to 6' to clear the tool box and my jeeps tailgate and spare tire. So about 14' total length. Between the wheel wells is 49"