Greg, it looks like if you have a straight 120V two-wire generator it would fly, but from what I’ve been reading on the Q&A on the OSHA site, it sounds like if the generator is both 120/240V, it might not be allowed.
Here’s an example reply from the Q&A that has me wondering:
In the OSHA standards for portable vehicle-mounted generators, equipment grounding conductor bonding is mentioned in 1926.404(f)(3)(i)(B) and in 1926.404(f)(3)(ii)(C).Neutral conductor bonding is mentioned in 1926.404(f)(3)(iii).
The intent of 1926.404(f)(3)(iii) becomes very clear when one considers that the term “neutral" is used in its technical sense. A 120/240 volt system has a neutral and therefore must be bonded to the generator frame. A 2-wire 120 volt system has no neutral and therefore bonding is optional. Recall that neither side of a 2-wire derived system is a neutral and when one grounds either side, it becomes a grounded terminal or conductor, but it is not a neutral.
