The items of expense are here segregated in such a manner that they may
be used as a basis for figuring the cost of hauling logs under average
conditions. These costs are for the truck and trailer as a unit. If a
road has to be built, the overhead charge of the road per thousand feet
of timber hauled over it together with the cost of upkeep must be added
to the figures given below in order to know the total cost of
transportation per thousand feet.