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There are significant losses in your typical budget generator, and a charger that can handle the load (rectification, regulation), if one exists for your pack voltage and can handle ~10kw, are probably not super efficient in budget land as well.
I don't know how cheap a 10kw diesel generator and suitable charger are.
plus whatever power you put in the batteries will come at a charge/discharge loss. This is a fundamental compromise in this design, as keeping the generator loaded properly keeps it near its peak efficiency, but the batteries are that load when driving demands are below the generator output. If the generator is 85% efficient at rated load, all power in and out of the battery will be notably less.
And there are losses in the controller.
And losses in the motor (which can be load/rpm sensitive also).
and losses in the existing drivetrain to consider plus trailer/equipment when sizing the generator (and accessories, lights, fans).
But if you only take a few long distance trips then I could see a basic generator and charger helping certainly, the charger might have to be robust, and the generator remotely started/stopped.
In a diesel locomotive the whp is about %85 of the bhp, but bigger is often more efficient too, so I am not sure that figure scales down to 10kw.
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