Pebble sleep mode and 12V battery concerns during storage
EVgo definitely doesn't work with the Pebble, and InstaCamp doesn't keep it from going to sleep after a few hours. Not what I expected, especially since the battery was at 51%. I'm concerned because we are heading to Europe tomorrow and I don't want to find out the 12V is dead when the solar could have kept it charged.
I did figure out that regen mode works in a pinch. Got it up to 65% after driving around on the highway for 45 minutes—enough for me to hope things are fine when we get back.

The Pebble monitors the 12V battery even when asleep and will charge it using the high-voltage pack when needed. A 65% charge should be able to keep the 12V stable for months. There is no way to keep the Pebble awake below 80% unless you are in the trailer and periodically perform one of the activities listed in the manual, such as pushing an internal switch, using a fan, or running HVAC. The manual has a full list of qualifying actions and sleep timers at various states of charge.