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1996 Toyota Land Cruiser
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Firstly, yes, you can. From my experience with fuel-electric hybrid drones, you get about 50% efficiency. So in order to make 20kw from your generator, you need roughly a 40kw gas engine to drive it. It certainly is possible and from what I understand the components to turn an AC motor into a generator are pretty simple.

If you want to do it then you should build the vehicle as a standalone EV first with enough battery to drive around, like 5+ kwh minimum.
 

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1996 Toyota Land Cruiser
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The lower efficiency of a generator plus motor (plus controllers) compared to a mechanical transmission is an issue, but 50% would be horrendously bad. Both generators and motors should run at least 90% efficient anywhere near their optimal operating point.
That was real world performance on 4 and 6 rotor drones using 1, 2, and 4 cylinder gas engines. Hobby grade components. There is likely a lot to be gained going up in size. The drones were in the 1000-2000 watt range only.
 
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