Hey guys we have an 05 cardinal 5th wheel trailer. When we are at home I plug the camper into the house via a regular extension cord. It’s a 50 amp camper so we reduce it down to the 115v plug just to run the lights and charge the batteries. Every time you touch metal on the out side and your standing on the ground you get a slight shock from the camper. I plug the surge protector inline with this and it tells me that l1 or l2 and neutral are reversed. I have an older house so I figured there was something in the house that was giving me the issue. So I put in a whole new box outside and ran straight to the breaker box. This new box has my 50 amp plug plus a 120v gfci plug. When I plug the camper into 120 outlet it immediately trips the gfci part of the outlet. Do I have an issue with the camper some where or is this a common issue since it’s a 50amp service camper. We are using the 50 amp plug now since I have it installed but I just want to make sure I don’t have an issue in my wiring in the camper