This is a great idea that makes a trailer tire change (with multiple axles) extremely easy and fast. Fairly small and easy to store. I've used mine twice now, and helped another RVer for my third use. Loosen the lugs on the flat tire while still on the ground, then simply pull (or back) your good tire on the same side up onto the Trailer-Aid. The flat is now up off the ground and ready to change. Back the trailer down off the Trailer-Aid, torque your lugs on the just-installed spare and you're ready to go. One word of caution: while there are "teeth" around the bottom of the Trailer-Aid, they do a better job of digging in to hold the device steady on dirt, gravel, or asphalt. Some concrete surfaces are just too slick to get it to bite and hold it steady as you pull up on it.