Yes, both XP's in our group had nylon shock covers and when we stopped I could smell a plastic burning odour. The front shocks,(one more than the other) were so hot that you could smell them, certainly too hot to keep your bare hand on them. Yes the trail was bumpy and we did remove the covers which resulted in just vey warm shocks. One sled's was on setting 3 and the other on 1 so spring tension did not seem to be a factor. No real problem but heads up to you guys with covers that they may wreck your shocks. Darn, I liked the look of those covers.