Plugging and unplugging the line cord should be done with zero load on the camper to avoid sparks at the plug blades that will pit and overheat the connection.
I do this by turning off the breaker, either at the plug (shore power side) or the camper's main breaker (inside the camper). Once you are connected, then you just reset the breaker you switched off.
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
HAM CALLSIGN - KC3FFW