A buddy of mine who does a lot of camping has a portable solar generator thing that might be feasible… not sure which one he had but something like this https://www.walmart.com/ip/PECRON-E600LFP-614Wh-1200W-Portable-Power-Station-Solar-Generator-LiFePO4-Battery-for-Camping-RV-Home-Backup-Outdoor-Emergency/1304938986?wmlspartner=wlpa&selectedSellerId=101132533&gclsrc=aw.ds&&adid=222222222271304938986_101132533_150868523029_20369052668&wl0=&wl1=g&wl2=c&wl3=665693022399&wl4=pla-1964598910726&wl5=9057544&wl6=&wl7=&wl8=&wl9=pla&wl10=551716940&wl11=online&wl12=1304938986_101132533&veh=sem&gad_source=1&gclid=CjwKCAiAu9yqBhBmEiwAHTx5pzwScVrkR8W8s1q0EdkfoeQ1MV4ImKMSAAgSee2bpxYtqxeu-0pLNBoCGEoQAvD_BwE might work
When camping I’ve seen small, portable generators that were actually solar, had a few outlets BUT is your parking area secure enough where you could use it and not have it ripped off?