Should we buy used 5th wheel

Another issue. One thing I noticed over my years of reading on here is that people would say that many of these rigs are not intended to live in. I bought my FW from an older couple who only used it a couple times a summer to go with their grand kids. It was in excellent condition for 14 yr old. During our first 3 years we have been in it for 21 months. When I looked it over the bottom of the slide was like new with minimal witness markers where the slide travels on 5 rollers. I started noticing the travel path of the rollers more and more and it has now pushed up into the osb bottom of the slide enough that it's dragging on the bottom rubber lip. I'm going to use aluminum sheet to give the rollers a solid path to roll on. This is what they are talking about when they say not designed to live in. I didn't do anything wrong with the rig, I travel easy and slow down for any rough areas as best I can. Like most stuff on lower or mid level RV they design everything at the minimum and I exceed that. You cant run a piece of plastic fabric covered osb over a 1 inch diameter roller that many times without the roller eating itself into the osb. It's also strange that it's worse in the position where the side is out (inner edge of slide) instead of the outer edge where all the stress of rolling down the road is. I put far more miles on it in 7 months than they did in 14 years. Be handy or have a lot of money is often said on here too.