Glad you had a good trip and the bonus is when you have trouble as you arrive home in your own driveway. Of course having no troubles is always what we shoot for. I would take your voltmeter and check your batteries for state of charge (12.6 v is fully charged for wet cell unloaded). Then test all your charging systems individually operating with the others off (shore; generator; alternator) to see what is working and what is not. If you are having some intermittant charge functioning it could be a loose connection; or poor ground that needs to be tracked down. The other thing is maybe the alternator is also going South too.