I have used a kid's wooden baseball bat and a regular bat on a 122, and 140, allowing the tire to roll against lip and absorb/indent from the bat as someone very slowly drives down the driveway. Not much lip on a 544, are you going to also "bow" it out a bit? schedule 80 PVC prob. would work in available size to roll between tire and lip. this device you mentioned sounds interesting. Let us know how it all works. love the Lagunas