I have been a electrician for many year now, too many ready to full time rv. O8flagvlite your right to say there a big pain for RV shore power.The 15 amp GFIC outlets is really meant for lite load. The earth ground should not have a effect a the rig. The ground is isolated back to the main. IF everything is wire right it should work. The problem is your plugging a big load in to it. Long cords or bad plug & cord & x-overs are some of the problems too. I just wire a 20 amp sp. grade in for the home owner if he has #12 wire at the GFCI. IT helps with the surge load but not 100%. how many time has someone plug in a big saw or drill , hair dryer & tripped the GFCI, it that surge & load sometime is pick up by the GFCI as a fault & some rig do have a ground to neutral fault in there wiring sometime like Bama Ramber posted.
2010 wildcat 31ts
05 Ford F350 SD PS