Sears marine Diehard group 31 weighs #75, my battery is 25.5 lbs lighter and has 68 Ah versus 100 Ah. If you are running a fridge the group 31 might be better but for now this is just my speed.
I'm running the die hard platinum group 34. Ran a fridge a couple of times overnight. Never had any problems the next morning, even on the mexico trip.