Thanks to everyone. I ordered the 5amp. Waterproof Battery Tender from amazon for the house batteries because I might have it outside under the motorhome so I don't have wires running up through the steps into the coach with an opening for mice to get into the coach. Still looking at the Trik-L-Start and trying to figure out if I can connect that too. I want to take a closer look at the installation. If not, I'll probably order another Battery Tender and figure out how to keep the mice out. Thanks so much!