We are ready to buy a 2008 Icon M-24D Dodge Diesel. It has 113,000 miles. My concern is the generator hours. It has a little over 400 hrs. Is that good or bad?
I believe that's built by Cummins/Onan. It's a quality product. If it's working okay now, you'll be good to go.
Just exercise it monthly under a load. I have a 20 year old Onan, it runs great.
Do a Google search for your make/model. You'll get a rough idea of what a replacement will cost. My guess is, it will be working properly and last you a long time.