We don't have our Jayco yet; we're currently towing a Forest River PUP. Last year on the way back from CO to AZ, the trailer blew a tire - shredded it royally, but fortunately didn't damage the rim. Found out then that the truck's jack and lug wrench didn't do jack with the trailer! Waited 4 hours - on the side of the freeway - for a guy to come fix it for us. (Took a while to convince the roadside assistance operator that it doesn't matter how many miles it has on it: it's a towable, not motorized.) Though this was on the shoulder of the freeway, all turned out well.
Two days ago, on the way back from a shorter, closer trip, the replacement tire failed. It wasn't anywhere near as spectacular, and by comparison was a great experience. We now have a two-ton jack (which we hope/trust will be okay for the new trailer) with a handle extension, and we have the proper lug wrench, too. The flat was on the shady side of the trailer, there was plenty of room on the shoulder (plenty of ants, too, but we avoided them), and there was no scary traffic.
Sometimes living and learning turns out pretty well.