Now I have put any number of bows and tarps on the M1101 trailer. So, even though I am not a "wheels guy", I feel like I do know something about the M1101. The pictures you posted show me on the inside anyway, something I have never seen. The "bows" and no longer bows. And the tarp is not one I have put on. So, its probably new, and not in my TM 9-2330-392-14&P. The TM for the M1101. The pictures you posted show two data plates, but do not show a NSN, nor the Operators TM on it, like most all trailers have. I can only assume the data plate I am speaking of, is missing? Or maybe this trailer never got issued a NSN, due to the fact that it was not widely issued. There should also be another data plate in the frame, normally on the front right side, just before the bed. Can you look again? Also, your displayed data plates, do not give a model number. You may be assuming that its a M1101, just because the bed looks like one. That may not be the case. The data plates state to "Look at the tech manual, for the CAPSET configuration. So there is books for it. Or should be.