I would just drive it to a gas station to top it off. I have a large compressor at home to top off the tires but when I travel I carry a cheap portable and plug kit in case of a flat. In 12 years I used it once on the MH tire and once on the tow car. I found the portable allowed me to fill the tire enough to drive to a gas station and top it off to the correct pressure after I pick up a screw. They work good at lower pressures and short times but are easily destroyed by the time that it takes to achieve the higher pressures.