We had a blowout near Mexican Water (or Mexican Hat, can't remember the exact name) in northern Arizona, near the turnoff to Monument Valley. Because I pulled off the highway into the sand (and sank up to the axle), we could neither get the spare out or get a jack under the trailer. We waited for hours for a tow truck to come from Cortez, Colorado with a floor jack (the alternative was to wait the same amount of time for someone to come from Ship Rock, New Mexico -- We were in Arizona!); and the tow charge was $450. Oh, we were also stuck in the sand!
Anyway, we now carry a floor jack in the bed of our pickup; a very cost-effective and time-saving alternative to relying on AAA or other roadside assistance. We checked with other pickup and RV owners, but everyone had the standard jack that came with their vehicles (same as us). A big lesson learned...
(By the way, our tow coverage reimbursed the charges; but it was a long day waiting for help on the side of the road. Also, not much selection in trailer tires in Cortez; although we did find that the Goodyear dealer had two Carlisles, so we didn't have to buy a Marathon replacement.)