Join Date: Nov 2013
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If it was me having owned all 3 fuel types of Onan RV gensets over time, I'd go with a Honda or Yamaha instead. Much, much quieter and smoother running, and will use less fuel.
Now having said that, you know the Promaster comes with a second fuel tap on the fuel tank just for this purpose, so that should be an easy setup.
Winnebago is building class B RV's on the Promaster with the Onan genset, but no body has seen one yet out in the field.
You can buy lockable generator boxes that sit outside the vehicle and can be mounted on a trailer hitch type setup to hold them while running.
Good luck on this
Current 2013 Sprinter Class B RV Van owner
Our Second Sprinter RV (and last)