Instead of running your engine from time to time to charge the chassis battery, why don't you make up a small (10 gage or so) jumper and connect the house positive to the chassis positive from time to time ( or the whole time your are plugged into shore power for that matter). The negatives are already connected together.
That's what I did before I installed the Amp-L-start.
Stan
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2004 Itasca Sunrise W22 chassis GM 8.1 Allison 1000 Towing a 2007 Chevy Cobalt four wheels down.
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