We spent 10 weeks this summer, from Texas to Alaska and back, mostly dry camping in BLM and National Forest sites.
Our (diesel) generator is noisy, shakes the rig, and makes bad smells. We ran it less than 3 hours total this summer. Solar kept our batteries charged, except one cloudy week in Denali.
Our dry camping stay time was limited to about a week - by fresh water, not power.
Plugging the rig's shore cable into an external generator, what would a transfer switch add?
Unless you're continuously in freezing weather, why would you need 80# of propane?