A log rolling, support and clamp assembly includes a longitudinal frame having a plurality of rollers coupled to and positioned along the length of the frame from a first end to a second end and permitting rolling of a log on the assembly. A log rest and an opposing log dog are coupled to the frame, the log dog being slideably moveable towards the log rest. The assembly is attachable to a portable sawmill and assists in handling the logs after being loaded on the bed of the sawmill. Also disclosed is a sawmill and a kit having such an assembly.