I bought this for my Rockwood Roo 24ft street trailer. The tires are very tight but we were able to make the necessary adjustments to make it work. They work great, just needed some modifications to the holes that were available. Not only does it give me WAY more confidence, but it also acts as a stabilizer. It's sooo much better than a plastic plug. I was worried they wouldn't work since my tires were so close and it took me a bit to figure out the configuration for the initial fit. But everything is fine from now on, I highly recommend them.