Here's the bumpers on the back of the trailer. I have been using these for stands also when the trailer is up on its end during winter storage.

A little closer view. You can also see the strip of reflective tape I put on the back.

Assembled for use as a lug wrench. As a test, I loosened the nuts that had been torqued to the specified ft lbs., and the wrench held up well.

Another view of the lug wrench. The biggest problem so far, is keeping the wheel from turning while using it. Even with a chock-block in place, it tended to lift the trailer.

This is kind of an exploded view of the thing assembled for use as a lug wrench. The piece of bar stock that connects the two bumpers, nests in the left bumper when not being used as a wrench.

This is a photo of all the parts in an exploded view along with a parts list.