OP needs:
More voltage while charging
More Amps while charging
More generator time with the above 2 items.
Ger rid of the Optima's for weekend camping.
If you can get a decent charge in them daily, the least problematic to recharge batteries are a pair of 225 amp 6V GC-2 Golf Cart batteries, and wire connection to hook them in series to get you 12V out of the pair.
Costco, Sams Club GC-2s and if you want the full time good stuff for day in and day out usage, Trojan T-105s.
From there, you'll need 200-300 watts of solar panels, and a 30 amp charge controller, that has adjustable bulk charge voltage that you can set at around 14.8 to 15.0V to get your batteries topped of daily while camping.
You can and should adjust the voltage on the charge controller while in storage back to about 13.4 to 13.6V for float voltage. Reset again up to 14.8 to 15.0V when camping.
