Although I am fully solar powered and never worry about keeping the bats up, I have a 4-way disconnect switch for the two house batteries. No disconnecting, hauling around 70+ lb bats, getting dirty, just flip the switch to off and forget about it. Cheap fix and easy to install. It has been the first mod on every RV I've owned.
My two house batteries are not outside, but under a hood that raises up to get to the batteries and 2 x 30lb gas tanks. The switches can be reached by reaching under the hood and not having to open it. Can't get any easier than that.
If your batteries are in outside boxes, you can mount the disconnect switch directly on the side of the battery box.
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP