Are you sure its 3 volts per wheel? I thought it was 3 to 4 amps per wheel. You only have 12 ish volts available and I get 12 at each magnet when the controller is fully applied. I can usaly still hear the magnets but I tend to Jack the trailer up and spin the tire or try to if it is working.
A Medicare wellness visit is not the same things as an annual physical. When I first started on Medicare my doctor said I could do one or the other as the wellness visit restricted what we could discuss. My doctor now does both in the same visit but they are billed as two different codes.