I wouldn't wait until the spring cracks. It happened to me and I was stranded at the lake. Luckily this gentleman let's me use his lot overnight while I went to get new springs. The springs are easy to change out. Won't take long. I've bought stronger springs for my trailer since the manufacturer installed the basic ones. The springs are what hold your axles together. If they cracked you are a sitting duck on the road. Replace them when you think they're bad.