Paul,
We had the same Monterey for 12 years. So, at various times it had to do duty in neglected storage.
I never dumped the air. But, I don't think it really matters. No matter what you choose to do, no damage will be done.
Electrical is a bit different because batteries are involved. You have to completely disconnect them or feed them with a "float" trickle charge. You either plug it in, or fully disconnect them with the switches in the back.