I posted this because Mike and I was talking and he had asked why nobody has come out with a harness that used the inertia lock, which would be really handy for the slow rock crawlers. The only problem I see with these is the top seems to still go across the chest. But, I think the potential is there to modify these to where the inertia block can be mounted behind the seat attached to the cage. All you would have to do is lengthen the 2 straps to go up and over the seat or through the seat if your one of the fancy guys.