I have a utility trailer that I use every now and then. I keep it stored out of the way during winter and bring it up by my house during the summer. I checked the tire pressures when I moved it and they were in the 48 to 50 psi range. I run them at 50 psi. Walked by the trailer the other day and saw that the spare tire had blown out. I bought all three tires at the same time and had mounted. The spare has never been put on the axle. Tires are Carlisle Radial Trail. I find it odd that the spare separated and not one of the ones on the axle. Anyone ever see a spare tire blow like this?