I think Frank Condelli talked about getting one to try.  e-Mail: Fkc43@aol.com  although it may have been Karl from Westy ventures? Can't remember.  If you find a souce, please let me know as I'd like to get one as well. That's a great AH rating for a battery that will fit under the drivers seat rear compartment. By the way, under charging the battery for few days is not going to kill it. You can always buy yourself a smart charger, like the battery minder, and charge it anytime you have sure power. I have mine wired into the plug that the refrigerator goes into. So, any time I run into shore power, I just plug in at 8Amp charge rate it brings a battery up to snuff in no time. It's long-term under charging that will cause a problem. AGM's definitely have their pluses and minuses.  Going completely to AGM's is certainly an expensive option, along with increasing the output voltage of the alternator. Let us know how it works out.

Troy