In over 50 years of traveling we have had many flat spots on our trailers. Changing a tire has always been a problem, especially in hot weather on a busy highway. We started out using a bottle jack, then progressed to stacked leveling blocks, and finally, as we got older, to AAA. We now have Airstream, and hacking is a bit of a hassle for an up-and-coming AAA service. The old tires had to be changed before the next trip. No AAA like we had in our driveway. Putting a trailer on leveling blocks in a cement driveway is scary. Went to Revane and found this ramp. Perfect, no slip, lots of height. Easiest tire change I've ever had in my 75 years. Should have worn one of these from the start. Too bad there aren't 6 stars.