AC Portable Generator Electrical Voltage Drop/Fluctuating

sounds like the generator is over heating

used the oem generator compartment

did you add any fans for cooling to the compartment

are you running it with the compartment door open for extra air/cooling circulation

in the previous RV-ClassA DP, in order to use a portable generator
i installed a sliding tray/drawer

and mounted the genny on the tray

slide out to use, slide back in to store

made it easy to service, and allowed maximum fresh air cooling