Could simply be all self discharged . Couple of months allows for significant wet cell battery discharge especially in winter storage. It is possible that the battery isolation circuit failed to isolate the coach battery. Parasitic losses from propane detectors ,etc bleed you dry given enough time. Don't feel too badly about leaving the battery switch on. The coach may still have powered circuits ahead of the switch. My coach steps and jacks still get power with the switch off. Best to visit your coach and run the generator for 30 - 60 minutes every month even if you can't take it for a 30 min drive. The genny really needs the excercise and most are wired to charge house and coach bats when running. In any event, unfortunately, discharged batteries will have a reduced service life. May not want your first trip out to be all dry camping.
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2015 Solera 24r
2017 Jeep Wrangler
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