need to know a little more about what you want to power.
6V golf carts are good for low-medium draw applications, less than 30A or so max. Above that voltage drop from internal resistance comes into play and can limit use with large inverter draws. A solution for that is 4 GC to reduce draw/pair if you have room. Or if you constantly want high current draw, good 12V deep discharge are a better choice.
And how often and how many days do you want to boondock. If it's only a few times/year and a few days at a time, a couple of decent true Deep discharge 12V may be the best cost solution.
For my situation I have 4 GC batteries about 500AH. Of which about 350AH is useable. Good GC can be drawn down to 25% SOC (75% DOD) and still give hundreds of cycle of life.
And the GC are taller than a regular 12V so do you have room for them?
And finally, the weakest link in most trailers isn't the battery, it's the WFCO charger which almost never will go to bulk charging mode so (1) batteries never get fully charged and (2) charging current limits to around 10A which means you can run the generator all day and not get the batteries charged. Solution is a Iota or Progressive dynamics drop in replacement,
I have solar, yes it really helps when the sun shines and you can have either the trailer or the portable panels in the sun.
2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!