Some years ago, the government did a study about the optimal time to trade in a car. Now this study conidered reliability, gas mileage, insurance, repairs, etc. The conclusion of this study? Drive it until it drops.
Now I am a bad example for this, but I believe it also applies to motorhome, and certainly to diesel pushers. If you are generally happy with your coach -- keep it. If you want a differnt one, look for one 2-4 years old, and leave yourself some cash to fix it to your heart's desire.
Now, I am a sucker -- I only buy new (seven since 1985). So, do as I say, not as I do.
Duncan, 2012 Itasca Ellipse 42QD
2014 Honda CRV, wife and cat
Florida and South Carolina