Ditto on the Auto setting. Easy. When traveling, the frig operates on propane, once you plug in, it's on shore power. No need to change with the settings.
A couple of things rarely mentioned is how full to pack the frig and defrosting the freezer. I learned by experience on a long trip to just pack the frig "reasonably full" and just plan to stop for resupply more often. I tried to load it up for a trip to the UP for 2 of us for a full week. Mistake. The frig does not work as efficiently since the air cannot circulate. Give yourself 4 or 5 days tops and then find a Walmart.
When you start to see maybe 1/2" or so of ice building up in the freezer, time to defrost. Maybe sooner if it doesn't seem to be keeping things well frozen. Since we store at home, I just shut off the frig entirely, but leave the frig door closed. Open the freezer door and usually in about 3 hours it's pretty clear. I did ours last evening and it wasn't quite clear. About 10 minutes with a hair dryer fixed the problem, wiped it dry (wish there were a drain to the outside for the freezer) and turned the unit back on. It gets cold pretty quickly and everything I put in was already frozen. Back in business. Don't let it get too frosty.