my wife and i have been talking about getting a small camping trailer and my truck has a spot to put a second battery in it so i started thinking it would make sense so we could run some electronics if we get the power converter so here is my question. i read somewhere else on here you can get an isolater to hook to batts up and have them charge on the alternator but is the second battery supplying any power to anything or just sitting there adding weight? would you have to run accessories off the battery itself or can they run through the power accessories like everything else does. im sure somebody out there knows what i mean. thanks in advance for the help