If I can keep the fridge (our fridge is only 10 cubic ft) and batteries up on 30 amp service that would be great. We could run the generator if we need to use the stove, etc.
AJ, a 30A used via a 50-30 adapter will keep your batteries charged, and allow you to use much of your bus devices just fine. Stay away from the high current draws like air conditioning and electric heaters etc. You might be able to get away using a single AC unit, with 30A power.

At worst, and Mango indicated, you may need to go to your inverter charging controls, and either step down the charging current, or on newer models, tell it that you're attached to only 30A plug.

If you've just driven for any length of time, your batteries will very likely be fully charged, and your inverters will very quickly go to float charging, using very little current.

Don't be afraid of 30A service, it's fine for "regular" use. I would be concerned when it's 110 degrees out, and you need to run multiple AC's to cool the bus.

Ray