For batteries, I recommend a pair of 6V golf cart batteries. That is about 225 AH @ 12V. These would be cheaper and store more energy than a pair of dual purpose marine/RV batteries. AGM golf cart batteries are available but are $$$ !
The real issue is recharging, especially when shaded or during short days. I think you are going to need more solar panels than you can practically mount on a TC.
This means a generator or a DC-DC battery charger
(and running the truck engine for hours) is a must !
Don't forget a good battery monitor like a
Victron BMV-700 !