On one of my prior M100 trailers I made a swing out lantern/coat/towel/whatever holder. Took a T hinge and welded some 1/8 x 1 steel strap to it and notched a groove near the end. Sorry, no pics of it survived. You could mount it to your uprights and fold it out of the way when not in use. A nut welded to the hinge makes a stop for it turning too far. A bungie cord or similar should be easy to come up with to keep it open. Or, make it to mount with a keeper pin like on your tongue?
I also mounted a spare tire mount under the front of the bed from a Dodge pickup. Crank up cable. I kept the extensions for the crank and made some guides for it. Could raise or lower the spare with the ratchet handle without getting under the trailer.
Another idea for a paper towel holder is a small 1/8 cable plastic covered, loops on both ends, strung between two upright surfaces; and attach with 1/4" quick disconnect pins on the ends to a small angle bracket. Hint: A bungie cord through the center of a roll of paper towels will work similar.