By virtue of good fortune, my Classic was purchased with a Xantrax Charger/Converter/Inverter. Have found a local shop to go over the unit to make sure all is good before I start with any other upgrades.
I'm talking with someone who has started farming where power isn't available. It's just chickens for now, but still, he needs chargers for electric fencing and such. Using HUMONGOUS 12v
batteries, he's checking on where he purchased for any special deals.
Driving to Farm next weekend, I'll get a good close-up look at these batteries to determine if they will require mods to battery drawer.