Bought this in 2014 when I got the Xterra. Set them up as directed and hide them. This month I got stuck in the sand while towing a small trailer. I dug out the deflators, put one on each tire and after 10 minutes the hissing stopped. Used a shovel to get some sand behind each wheel, got it to low reach and the SUV and trailer came out with no problem. I also bought a Viair 00088 88P portable air compressor which is great for inflating tires. I let the compressor cool down between each hoop before doing the next hoop.