Ok so this might be a dumb question but here it goes anyways. I have 2 trojan t-105 on my gearbox and between trips I like to keep them topped off. If I leave the batteries on the hauler can I use a 12 volt charger and just hook them up like they are on the trailer? Or do I need to disconnect them and use a 6 volt charger? I have always disconnected them but was just wondering thanks.

The 12 will work..