Honestly, a 4 year-old 'new' rig isn't necessarily any better than a used one of the same age. Have they been checking the roof for cracks? Have the seals been treated? Are the tires already at a 5-year age in need of replacement? Are the decals already drying and cracking from sitting in the sun? Arethe propane tanks already approaching inspection dates? Have the brakes rusted or locked up? I could keep going...
Most rigs do not get used THAT much (unless full-timing). IMHO age/weather does far more to a rig than the actual use does. In some cases, then, having it used by a responaible owner would make for a better rig than a new one that's been sitting on a lot for years.
So, I agree with others but go even further - inspect carefully, get warranty assurance, make them put new 2019 tires on, and still make them give it to you for no more than you could by a used one.
