Fixed! And it wasn't the Lance! It was a short somewhere with either my dome lights or radio- they're on the same circuit in my truck. After doing a parasitic draw test, I had a 3A draw on that fuse. Gads. I pulled that and no problem. I went through the courtesy/dome/glovebox lights and couldn't find anything obvious, so it's probably the radio (the original one! with the two head units/EQ and all) that will be replaced this summer anyway. Until, no biggie to just leave the 20A fuse out and only plugged in when I'm driving the rig. Beats the alternative.
And my new 10W solar panel and charge controller seem to be keeping everything up and running day-in and day-out now, with the Lance still plugged in. I'm installing the 200W solar system this weekend with a 30A charge controller, so that'll isolate the front battery bank (two DuraLast Golds in the truck) from the back battery bank (two Optima blue-tops in the camper). I'm also upgrading the circuit breaker in the Lance (tiny little thing) with a 60A breaker designed for a marine outboard motor (Minkota?). The camper battery bank is going to be (re)located in the cabinet under the booth seating by the back door- extending the wires from the battery box to there. And trying to think what I'll use the old battery box for...
