Harnesses
It is very important to use a proper weight pull harness when pulling any kind of weight. A proper weight pull harness will have a spreader bar at the back end, and be substantial in it's construction, and will fit your dog properly. A proper harness will distribute the weight across your dog's body and keep them in the most efficient pulling position.
Here are links to some of the best harness suppliers around:
Missy Kehler is an experienced weight puller and dog rescuer who builds economically priced stock sized harnesses as well as custom made harnesses that some of the best pullers out there wear! A portion of the proceeds of harness sales go towards animal rescues & shelters
Missy Villines has over 25 years of competitive weight pull experience. Brown Dog harnesses are worn by more national champions than any other maker.
Cindy Kernovich
Adam Raburn
Jimmy Allen
Mike Apaga