I have a blowout or two a year, it sucks. I can change them in 10 min now. NEVER be without a spare, a four way lug wrench and a bottle jack.
I should be like Derek and carry two, once I ran over a box of King 50 staples that fell off a construction truck, had one blowout and one slow leak.
It is always the passenger side that I have issues on. I think it's because that side is in the ditch and running over more crap than the driver side.
Be sure to inspect your trailer well after a blowout. I had a bad one last fall about 400 miles from home. Swapped the tire, no problems, got home and didn't tow farther than three mile trips for the rest of the season.
This spring, I realized my trailer brakes were inop. I found a snapped brake line on the wheel that had the blowout. My truck brakes are good, so I didn't really notice, but it coulda sucked on a panic stop. I now know all there is to know about trailer brakes
(I took pics, Derek