I have 2 12v batteries and installed a marine type (PERKO) switch. Very easy to install and allows me to select 1/2/both/off. When I store my 5er I just select off. When I pick it up, I turn it to both. Batteries are topped of during the drive via TV. When I dry camp I select #1 and when it shows signs of being low on charge I still have the 2nd battery avail and time to re-charge. So far all works great...Time will be the true test though...
NOTE*** CAUTION!!!You MUST remember to turn batteries on before towing!!! If the trailer should ever detach the elec emergency brake will not work without battery power!!!
Dave
Dave,Sherri,Danielle & Holly
2005 Mountaineer 318BHS
2003 Chevy Silverado Crew-Cab Duramax 4x4 SB