That 2nd one will use a lot of gas I fear. You should also be able to run a shed load more than 4 chargers on it too.
1000W = 1000/12 = 83A @ 12V
But we charge at 7.2V but including losses even you should get more 10 chargers+
Vermin has a nice 1KW one and is usually runs at least 6 chargers, a tele and lights at nationals.
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