Maybe if you navigate to a supercharger, but then drive somewhere else you might trick it into preheating a bit.
Do you have electric at your caravan? You might be able to use your UMC to get enough for pottering around/to reach a rapid on the way home?
Edit. I don't have a Tesla so this could be crap advice!
Do you have electric at your caravan? You might be able to use your UMC to get enough for pottering around/to reach a rapid on the way home?
Edit. I don't have a Tesla so this could be crap advice!