Road building is a Komatsu d51px-23 heavy enough for spreading blasted rock ballast and limited quarry work
What size is the rock
starting off 2 foot ruble on the road as fill 12 inch and down, i know it would be fine with 1 inch crush
You could do if your careful. It would slow ,hard on machine and operator. D8 would be more suitable for the job.
i was thinking a d6 t but am liking the smaller komatsu thanks