Cautionary tale

Having seen what junk passes for jacks in various vehicles over the years, I have several bottle jacks and an aluminum service jack that has served me well. Last time we went anywhere over an hour away from home, I took the service jack along, and that proved a wise decision as I had two tires go bad on the trailer. One of the ones on the trailer when I started the trip. Replaced all of them on the road, along with the spare. Stopped for lunch an hour after tire replacement, and one of the new ones had gone flat when I came out to resume the journey.