Have you ever used one of these things before? If not, I suggest getting a used one now, see if you even like the experience and can tolerate being in it for long periods. A weekend here and there is not enough. Even if you have to spend a couple of weeks at a time in the driveway, at least get a good taste of it. Also, using it in only good weather does not count. Get in it during awful weather too. Full timing, you will have, at some point, to spend days at a time in the thing. If that is the case, definitely go used. If you are experienced in RV's, I say spec out what you want and go new. When you hit the road, you will know it's maintenance history and quirks. If you're keeping it as long as it sounds like you are, the depreciation becomes a non factor. We bought used for many years, and it taught us exactly what we wanted, and didn't want, in a rig. As retirement and fulltime get nearer (not quite there yet), we had an exact idea of what would work and what wouldn't. At that point we bought new and have not regretted it for a second.