Automatic Generator start with loss shoreline electrical

An AGS is the way to go if there is a power outage when the coach is unattended. They will do the same to maintain the battery bank when boondocking. Magnum Energy, Onan and Xantrex all make good equipment. Every one that I am aware of does a prime before starting and if it fails to start will repeat the process.
Simply set the thermostat for the furnace or AC and the AGS will maintain everything automaticaly.
Most gennys burn 3/4 gal/hr under full load.