Generator Stalls only while Driving

Thanks for the replies folks. Oil level is at the full mark so I have ruled out low oil. Since it starts right up after stalling, I don't think it would be an overheating issue. I am still leaning toward a fuel starvation theory since it was struggling to run just one AC at full throttle when I parked. The next morning, it ran both ACs again and still wasn't at full throttle. I don't have any fuel issues with appliances but those run on vapor while the gen runs on liquid propane I believe. That makes me wonder if there is a malfunction in the liquid supply system from the ASME tank. I don't know how to test that theory however.