Gerald,
If you are a little patient and have a few tools you can remove the dents. I had a substantial dent in the bumper on my previous coach and I pushed the worst of it out using my hydraulic jack and the weight of the coach by jacking under the hitch pressing most of it out.
Then I used a small belt sander to smooth the irregularities that remained after jacking and beating the dent out. That left me with a bumper that was back to the original shape but with an unpolished belt sanded area. I had used about 80 grit on the belt sander. I then used a disc sander and went from 120, to 220, to 400, to 600, to 1000 and finally to 1500 grit sanding discs. I then did a final polish using white rouge and a buffer.
I could see the area that was repaired, but unless I told others how to find it nobody knew the bumper had been repaired.
The bumper is heavy enough to allow you to make a lot of mistakes while you are learning and working it unlike the skins which are much less tolerant of attempting repairs. Take a chance and try it. You have nothing to lose. If you succeed you will learn the basics of a skill that can then be applied to repairing rub rails and then as the skill develops you can hide minor damage on certain skins.