175/80R13 Tires have an overall diameter of 24" so the Camco Vinyl Tire Covers # CAM45321 you referenced would be a compatible fit for your camper's wheels. view full answer...
It sounds like you need a new jack for a CrossRoads Z-1 TT Toy Hauler and if that's the case then we have some great options. I recommend the Electric Jack with Footplate part # EJ-3520-BBX as our best cost effective option. It would be a direct bolt-on swap.
I am not sure if you were somehow looking to repair the existing jack or not but I would need to find out which model you have as I cannot look this up, possibly a photo? However, I can't say I know will know which jack you have even... view full answer...