I got these for an off road hike in Death Valley about a month ago. The first time I used them was to align my 4x4 and rooftop tent while camping on a slight incline. I placed the traction boards on the gravel and slowly drove the SUV over them. The next morning when I packed up the camp and headed out I was a little disappointed to see that they had cracks on the ends. Although technically still usable, I'm still a little sad about the weakness of the plastic.