Just done my homework on this! Basically you're going to need an inverter type generator to run the chargers and laptop. A standard genny won't provide a consistent voltage and could damage your sensitive electricals.
In terms of running a caravan, most come with a leisure battery that should easily last 24-48 hours. If the unfortunate should occur and the battery ran flat, then the genny could be used to charge the battery if it has the capacity to do so.
Hope this helps
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