Run your group 24 MS, maybe pair it with a second group 24 MS. Run them until they both die. Replace with 6 volt golf cart batteries from Costco or Sam's Club, and call it good, or buy a pair of group 27DC's next time around. The 6V golf cart batteries will give 225 ah vs 180-200 AH for the 27DC's. They are also a better value, the 6V golf crt batteries, they are true Deep Cycle batteries, and 500 discharge cycles or more are possible, if maintained properly, watered and fully recharged at the end of the trip.
