We had a 4000 in our Bounder and it was a delight, start and run and run and run. Forget how many hours, a lot.
The Winnie is a 5500, had 550 hours on it and quit, I spent $2300 to get it fixed. The armature bearings were bad and a tune up etc. Ran about 4 hours and quit. Turns out the armature bearing was pressed on too far and brush on one slip ring got onto the phenolic slip ring assemble and lost power to the sensor and shut down.
Brand new armature from Onan, defective, maybe it's the design, it's a Code A generator, that means it is the first year of production, or maybe it was just QA at the factory.
Hope to get it back tomorrow but most likely next week.
The Champion 2000 runs great. Too bad it won't run the residential appliances our rig came with.