CA Traveler wrote:
Put a switch on the battery post so that everything is off.
Except your solar tender, of course. :B
IF....your batteries are healthy and fully charged when you park the rig....you should be able to let it sit with little to no discharge over at least 90 days IF YOU COMPLETELY DISCONNECT THEM.
While a switch is convenient, if the batteries are easily accessible, then disconnecting the negative cable(s) works just as good.
P.S. There is no "good" trickle charger. It needs to include a "smart" controller to prevent overcharging. Then it is an automatic battery maintainer.