I suspect there's something loose, since it only occurs while the vehicle is in motion. If you mean the generator motor itself shuts off, I'd check the electrical connections to the generator's fuel pump. Or that pump, if old, might be in need of replacing, shutting down with excessive "jiggle" while driving. If, however, you mean the motor keeps running but it ceases to produce electricity, then it might be worth checking the tightness of all the wire connections in your automatic transfer switch.
DD
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2010 Fleetwood Southwind 36D
2003 Jayco Greyhawk 27DS
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