A recent message said that while I am on the road my truck is actually not doing very much charging of the batteries in my 5'er. The trailer carries two group 27 deep cycle batteries. The poster sai...
Yes power is lost over distance and guage of wire. You will need a diode so you don't get feedback from the 5er. You need to have most shut off in 5er so you don't draw from it's house batteries.