Greg, velocity-sensitive is a great descriptor for what I was trying to describe. What I am getting at is if the ability of the fluid to escape through the valving quickly enough due to excessive compression velocity is exceeded momentarily the shock could become rigid for a moment. For that moment extreme forces would be placed on the mounts as well as the shock housing itself. The weakest link in the chain would eventually fail, probably a shock mount.
Alshere59, I always thought the mount breakage is most likely on the compression stroke of the shock due to the above description, but I also believe the most important function of the shock absorber is rebound dampening. The spring should control the compression of the suspension and the shock should control the rebound to normal ride height, Not enough rebound dampening and the suspension could theoretically over travel on the up stroke as well. Less likely though due to the weight of the vehicle. This would also use the shock mounts to stop travel. Like you, I love threads like this.............Tim