I wonder how fast they will a 88cf SCBA fireman’s bottle from 3000 psi to 4500 psi? Small compressors like this have been around for years ( google Shoebox compressors)and are OK for filling gun cylinders but too slow to fill reservoir tanks to feed the gun cylinders. They are basically high pressure/ low volume per stroke compressors. It would never be suitable for truck/tractor tires.