I think the ground problem was fixed when I found the faulty ground prong on the cord from the garage to the shore power cord...that is why it did not ground and I did instead while changing tires.
By the same token, this problem alerted me to the water heater problem AND I just found out I have a gas and electric heater...never knew that. On my other 3 campers I only had gas heaters with electric start.
As a result, I found the documentation on my heater and realized there was a switch on the outside that controls AC and it has been on even when no water has been present...and probably helped to destroy the electrode too.
So, now that I knew where to look, I found the electrode and figured out how to remove it. The anode rod didn't look good, but the electrode is severely damaged...and that is why the shock.
As far as the extraneous reading on the tester around the step hinge is concerned, that tester may be overly sensitive and the reading near the frame ground point is an overload of AC current inside near this section of the camper. I note this because when the steps are extended there is no reading except right under the floor where the power line chamber is located.
I think that when I get the new parts I will no longer have a problem. Funny how a blown tire can lead to an electrical problem that can lead to a bad water heater.
Thanks for all of the those who post on this forum.