If they are the EZ-Lube, rolling/turning/spinning the tire is "pretty" much a must. Kind of a pain if you're by yourself. I'm going to take an old washing machine motor, fabricate a base with rollers, driven by a belt/pulley system (to spin tire slowly). Then simply place roller against tire, power-up the motor,spin the tire, and commence "greasing". Before anyone calls "bull" on the system, I have several trailers with the EZ-Lube system! The "spin, grease, repeat" gets a little old!