Some projects are interesting to think about but not practical to implement.
I worked on the road for three years. Didn’t have any way to take hobby stuff with me. I ended up working 6 12’s simply because there was nothing else to do and the schedule demanded it.
Evenings were spent doing paperwork as I was the PM, super for a crew of 10-12 and on the tools.
When Sunday rolled around it was laundry and grocery day.
My niece’s husband stayed with us while he did his classroom work for his plumbing ticket and we barely saw him as there was so much homework.
Isn’t there homework at night?
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Optima! Thats the famous AGM brand I couldn't think of! You could also stick to the 2nd alternator idea and just charge them as you drive! No idea how long you're on the road between evenings, but that might work. Also, a 120v->12v battery charger could work if you have a spot with power.I had two Optima batteries (in parallel) in the cab of my truck for years. The Optimas never let me down.
Maybe with the Sherline in tandem with charging things in a motel room could negate the need for a generator.
This could make for almost silent work in the mobile lathe vehicle.