That's exactly why I sold it. I just didn't use it enough.
At first I tried to keep it dual purpose. Camping trailer and utility trailer for trips to Home Depot, hauling leafs to the dump, etc.
First I built a rack to hold the RTT and left the trailer open for hauling stuff around home. Ended up not being very good at either of its intended uses. The rack and RTT made it hard to load things into the trailer. I had to use a tarp to keep my stuff dry in the rain when I used it camping. That made it a pain to get at my stuff, and the dusty gravel roads mixed with rain made it a muddy mess inside. I also didn't like the fact that someone could easily reach in and take anything when I was parked.
Then I built a lid for it. Worked awesome. Kept everything nice and dry inside and I could lock it to keep all my gear secure while traveling. That was basically the end of using it as a utility trailer though. I was limited to things small enough to fit inside with the lid closed. Sure, you can easily remove the lid for hauling bigger things, but its heavy and a PITA to do! I kept my gear in the trailer so all I had to do was hook it up and go. That made for a heavy trailer to move around though.
We took a family trip to Colorado a couple of years ago and didn't even bring the trailer. We were going to camp and wheel passes as we traveled and I didn't want to end up in a situation where the trailer was going to cause issues getting through a trail. We easily fit everything we needed for the trip in my JKU without the added weight of pulling a trailer halfway across the country and back.
So I ended up with a trailer that I only used a few times a year and couldn't really use as a utility trailer. I ended up selling it and buying an aluminum utility trailer with a folding ramp and built some removable wood sides for it. I can easily haul plywood and lumber on it, install the sides and pile bags of leafs in it in the fall, and with the folding ramp in the back I can bring home motorcycle projects, pick up a new snow blower, haul an ATV, etc. I couldn't really do any of those things with the M416. No tailgate and the sides were high, makes it difficult to get big or heavy things in and out.
Don't get me wrong, M416 trailers look awesome and I do miss it sometimes!