Yup, that's what I did, picked up,a switch like the one sdayman linked to.
That way I can use the 2 6 v golf cart batteries, the original 12 v battery the dealer installed or all of them or disconnect all of them. I bought a battery box for the 2 6v put it beside the original dealer box and teed into the vent hose.
From the 6v batteries I run my 1000w inverter wired to a dedicated AC jack in my living room. So when boon docking I switch to the 6v's and keep my 12v as backup.
Pictures of install
https://picasaweb.google.com/1003642...OyDt4_Qtv-9zQE