Problem Solved
The auto battery was putting out .5 volts. We unhooked a couple of hoses so we could get a good grip on the negative battery post and then left jumper cables hooked up for about 45 minutes. That and the Emergency Start switch got the engine running.
I drove to our destination, about an hour and left the engine running an additional 30-45 minutes. In a couple of days I’ll take the Vegas in to a local ship and have the battery replaced.
Thanks to everyone who offered advise.
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