Been there done that!! All of mine were cracked as well had them replaced at the local tire shop. The owner told me that there were a ton of chinese made valve stems that were defective!! This is not something that is exclusive to BC trailers. After I got the heads up, told the rest of the guys tha I fish with about the problem. Lo and behold had 6 differnt guys with trailers made by Ranger, Stratos, Skeeter all had cracked valve stems!!