I would have gone with Alibaba "Eve" LiFePo4 cells. They're less than $100/kwh in bulk. You can get $50 "Daly" BMS. For $800 you could have gotten 6kwh battery
also dont need expensive current meter when you already have shunt. you can get $20 solar power meters that work with the shunt.
I like the idea of using a dolly.
For $800, you could stay in a hotel instead of camping.
I suspect you get more nights with the rig.
Luckily, there's places on this planet without hotels.