I will say YES a small one (100-200 watt inverter type precise size depends on your converter)
WHY... A Generac 1000 (True 1000 watt "Traditional" generator enclosed about as loud as a Honda EU-2000i at half load) will power a Progressive Dynamics 9180 (mine was a plug in module so I could feed JUST the converter) for a good 6-8 hours on a small tank of fuel.. The ONAN sucks between 3 and 8 gallons doing that. Though the noise is not much higher
But i liked being able to use teh small one to top off the battery when needed instead of the big Onan.
Also,. from time to time I needed that thousand watts remote from the RV.. I have. for example an electric chain saw.
