The ROGERS Helper Dolly is a short trailer built complete with a kingpin, fifth wheel, and suspension system. It is designed to act as an intermediate unit to divide the kingpin load of the trailer and the tractor. The Helper Dolly is very similar to a Jeep Dolly, but it does not usually have the length required to meet bridge formula requirements. Properly configured, the Helper Dolly will carry approximately 45% of the trailer's kingpin load while transferring the remaining weight to the tractor. In order to utilize a Helper Dolly, the trailer must be designed and equipped with a Dolly Link.