We use the Prowler in short pushes, and it's completely replaced the sled drag in our conditioning. 50 to 100m pushes, walked or sprinted, with loads of varying intensities and numbers of reps. The only problem with the Prowler is the fact that it reacts differently to every surface it's on, so I cannot tell you anything about the load that would be accurate for your specific surface. If pushed 60k that killed me over 50m, and I've pushed 90k that was no great effort over 100m, on different surfaces. The Prowler is still being learned about here. We welcome everybody's experiences, so please post.