If we're talking safety, wood seems less safe than even propane or butane. I have animals that will need to stay sometimes for a few minutes without me in the vehicle when I'm shopping, etc. There won't be open flame.
Also, as for propane/electric/butane, I've tried all of these exactly once. Each one exploded in my face, inside the house I was trying to use them in. That's enough PTSD to never use those fuels inside (esp where I live with my animals).
As far as diesel, I don't have a diesel tank so now I would have to have 2 gas tanks (1 main, 1 for heater) AND a diesel tank. Not for me either.
I have seen people with fairly meager setups cook with induction without too much pull. I saw a full dinner including protein, veggies and rice (about 20+ min total), even cooked separately, on an induction stove off-grid in a van use about 35AH. Induction stoves can be set from 100W to usually 1500 W, they're way more efficient than regular electric stoves. This is likely what I'll go with, and just try to cook outside over fire as often as possible.
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