I have operated the truck and camper for a couple of years without the charge wire connected. But I have found one or two occasions where I wanted it - several days parked under trees in heavy shade, cold temps so heater runs a bit. I had to move the truck into the sun for a few hours after 3 days. If you have upgraded the charge circuit to the camper, the alternator will charge flat batteries much faster than the solar (assuming a small array) for the initial bulk charge.
When I get around to it I will hook the charge circuit from the truck back up.
