Sorry man, the better approach is to contact the manufacturer of the generator and find out how to do the neutral-to-ground bond inside the generator.
A portable generator that has a bonded neutral should be used to power lights, appliances, equipment and RVs.
(In the electrical industry, we refer these type of neutral-to-ground jumpers as "false-grounds" or "phantom-grounds". Though you prove your "jumper method" works, doing this is really a violation of the National Electrical Code.)
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