Mlee,
I can not say specifically for Jayco, but few MH of any type maintain the main engine (chassis) battery with the house converter. It is even worse now than it was as many ECU draw more when not operating than they used to.
First, I would get the specifications of house converter that was installed and if it is a 3 or 4 stage unit, leave it alone. And, if it is, then get or make a silly jumper to bypass the combiner/isolator so that can maintain both.
If you don't like that ides, there are lots of little battery maintainers that can be installed easily.
Matt
