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Having even a small battery bank to act as a buffer would allow you to have a much smaller gas engine, smaller generator and greatly improve your acceleration, pretty much any small lead acid starting battery would work and your weight and space savings by having a smaller gas engine would make up for the weight and space of the batteries.
It would be crude, but you might almost be able to get away with just having a contractor to switch the battery pack in to the loop for charging and another to switch it in for powering the vehicle and if you have dual motors it could be easier to switch it in for regen braking as well, all without a solid state speed controller, of course I like how smooth solid state speed controllers work but it sounds like that is one of the things that you want to avoid.
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