Our 2008 Monaco Dynasty was all electric with Aqua-Hot (diesel). I boon-docked with my group of friends in Quartzsite every January for 5-7 days for about 4 yrs. in a row.
I used the genny 2 hrs. in the morning and 2 hrs. in the evening as that was breakfast and dinner time (preparing food for the pot-luck).
Our genny would auto-start if needed but it never did with my 2 hr. AM and PM regimen. We had 8 house batteries, a 10K genny and one solar panel.
On our current coach we have 3 Lithium Ion batteries for house (replaces 8-10 AGM's) and I can go 11 hrs. before the genny kicks on. We have two refrigerators (Jenn-Air in the kitchen and a small one in the bay). The reason I know I can go 11 hrs. is that the electricity has gone out twice at my storage facility. :R
Of course that is with minimal loads. We do not have solar.
I never wanted propane on the coach, electric works perfectly for us.
Safe travels,
MM.