[wepaddle4]

I'm going through some maintenance items before winter storage (running behind schedule as usual).
I have a couple of electrical questions:
I have one dead and one weak battery to replace.
The alternator is fried, I think caused by the dead battery and age (original). It's not rebuildable.
#1:
I have two 8d's for starting and two 8d coach batteries I see a few posts in other forums recommending replacing 8d's with 3 group 31's. Pros/cons of replacing the start batteries with two new 8d's and the coach with 6 deep cycle group 31's. Will different batteries charge ok when the engine is running and when plugged in or should I just keep all 8d's? I have had very good luck with Interstate group 31's in my previous camper and boats and can get them from my local store for a very good price ($30).

#2:
The converter / charger appears to be original, it only charges at 11.5 volts (per meter and nameplate data), this seems pretty low to charge or even maintain them.
I'm considering a Progressive Dynamics 70 amp converter with the charge wizard, I'm hoping this will provide more life and better performance for the new batteries, is it worth doing?

Thanks

Scott