Given the small number of off grid campers, there are a many ways to do it as people doing it. It would seem each does what works out for them.
My quick look into off grid means; that with Solar I park in the sun, not the shade. Or, I have to mess with setting up ground mounted solar panels and leave them unattended while I am gone.
Either way I am limited to mostly to careful management of 12 volt devices which means no air conditioning, micro-wave, coffee maker etc.
I could go with the generator approach. Ignoring that fact that I wilderness camp to get away from such devices and there only noisy and less noisy generators . But then I have even more junk to lug around maintain and fuel.
It looks like my best option for sporadic off grid camping is a tent or PUP and just foregoing the creature comforts completely or an extra battery to allow a few days off grid in the TT between electric campground.
I have run jumper cables from the TV to the TT battery and ran the truck for 20 minutes for and extra days stay.