I had a flat yesterday on an old dirt road. The rear tire an my f150. The tire was very hard to get off. I eventually had to get a big rock and repeatedly beat it against the rim. This tire had been on there for a few years. I know people put grease on there when changing tires, as do I, but you would think there should be a better way? Like some kind of gasket or something to create a physical barrier. Any thoughts or remedies?