Disconnect the battery & forget it, provided there are no worries of it walking away. Farm equipment & construction equipment sit for months unattended, why not RVS? I leave my small boat, 50hp motor, unattended sometimes for a couple of months at a time in water on a mooring away from shore. No parasitic draws but I do have a battery switch. No problems.
If you want to feel better about the battery, take it home & put it on a charger for maybe a hour a month.
A wet cell will typically only lose 10% of charge a month. Leaving it on a trickle charge runs the risk of charger malfunction & boiling off the acid. One trashed battery for no good reason.