My first trailer was a 1998 Nash 22H. Those things are built SOLID and if properly taken care of will last a LONG time. I just sold mine last fall, knowing we were replacing it over the winter.
It had a previous leak in the roof when we bought it. That leak was covered without drying out the wood or repairing any interior damage, unbeknownst to us. We did have some gremlins when I opened up the roof to repair it. Other than that, it was a solid trailer.
We simply outgrew the floorplan with our second child and my wife wanted bunks and a bump out. I would not hesitate to buy the older Arctic Fox (IF IT IS IN GOOD SHAPE, specifically the roof), and the Nash isn't very old at all.
Either one should last you quite some time if take good care of it. That Arctic Fox might require a little more maintenance though. I took out my windows and replaced the butyl tape sealant around them. I noticed on my 1998 that it was dry and starting to crack. Its really a pretty simply process. I would recommend putting Eternabond tape around the ends of the rubber roof where it meets the sidewalls, as well as around the roof protrusions.
Good luck!
