Many pros and cons to what ever system you use. I will not only rely on just 1.
A combination of solar, generator and battery maybe the best. I have never tried solar due to my dry camping is normally fall/winter and camp in tall timber in valleys ie, not much daylight or direct sun light.
As asked tell us more about what your use will be and what you expect the system to run besides more than 24 hours or what your 2 12v batteries are not doing.
2013 24RKSWE (27ft TT) Cougar 1/2 ton series
2002 Ford F350 4x4 CC 7.3 Traded off 03-19
2013 Ford F350 4x4 CC 6.7 8ft bed 3.55 rear end lariat
Retired Oregon State Police
Now a small town traffic cop