There really wasn't a problem. While inspecting (based on reports of this "spa" hose cracking) the flexible drain hose for kitchen sink and dishwasher, I noticed the outer covering on the roller was coming off - so I thought it would be a good idea to replace the roller while I had the corner cabinet removed. But the roller was turning fine, and for the small number of times that I run the slide in and out, it probably would have been fine.
It's done now.
Now I noticed a small slow drip from the hot water PEX to flexible hose coupling for the kitchen sink. So I'm going to disassemble that fitting and see if there is a sealing (cone) washer in there. I suppose if one looks hard enough at their coach they can always find something to fix.
i found a tag on the hose, it is made by "Midtec Inc.", it's called "Easyriser Potable Water Supply Riser", "1/2" FIP Straight swivel". However after hours of searching for this seal/gasket, I have not come close to finding anything like it (or anything that looks like it would fit). Apparently Midtec has been out of business for a while. I may end up just replacing the entire flexible hose (hopefully the other end of it is not too buried).