Some PVC tubing makes inexpensive and handy tarp support bows.

This trailer mod comes courtesy of the Bantam Trailer List, with a great blueprint posted in the Files section (membership required).

The supports are 1/2” schedule 40 PVC pipe with some 90 and 45 degree elbows.  I didn’t even glue things together - keeping the unglued lets me shift a bow assembly back and forth by pushing one side at a time.

Here’s the main benefit - using a tarp over the trailer.  This is just a temporary 6x8 plastic tarp.  I plan to have a black vinyl one custom made soon.

This setup worked great at the campground - the tarp kept all the junk from the trees from getting into the trailer and also provided some reasonably secure storage for the cooler, etc.