If you leave it for six weeks without disconnecting the starting battery from the coach or installing a trickle charger, there are enough parasitic loads that the starting battery will discharge down to a level where it will not start the coach. Just the nature if the beast. The same thing applies to the house batteries.
Use the search function above and there are lots of threads and posts on this subject and how to fix it. In addition you should download Ed Felker's Vegas/Axis manual.
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