I had an Edgestar freezer/fridge that iirc, pulled 5 amps @ 12 vdc. Our 500 watts of panels were minuscule but managed. The golf cart batteries were 6 vdc wired in both parallel and series and each was 220 amp hour.
TV and DVD player didn’t take much. A laptop or even better, a tablet would be better than a desktop.
Yes, I am running 6 deep cycle marine and 600 watts of panel and never have to start the (12v) generator except if I get a couple cloudy days. I use my laptop, run the radio or TV, lights, microwave, fridge on 12v, just as one would in a normal home. And I could actually get away with only 4 batteries.
As you know, there is a fine line between battery/panel ratio. Too much battery and they do not fully charge during the day. To much panel and you are wasting free energy. So there is a balance to it. I would suggest to the OP for his rig 4 deep cycle marine batteries and 600 watts of panels would be a good balance.