I installed the 5500 lb Onan. Works like a charm. Two things that surprised me. 1-it has an auto shut off if there is too much or too little oil. It's hard to tell if it's enough because the dipstick view area is misleading. 2-It will start if your propane is low, but if it is too low the pressure lessens and the propane won't make it to the generator --- shut down. I took quite a while figuring that one out. Other than that, ours works great, for hours on end. We've been at several parks where the power goes off for several hours/days and i just push a button and it fires up!
Steve & Ginger Patterson
2018 Montana 3811 MS
2018 GMC Denali 3500 HD Duramax