Any provision of any other law or the provision of any administrative rule, regulation, or order to the contrary notwithstanding, it shall be lawful for any farmer, custom picker, or husbandman to operate a two to eight-wheel, one to four-axle trailer on the highways of this state if the trailer is being used exclusively for the purpose of transporting to and from a farm agricultural commodities or products and for agricultural purposes relating to the operation and maintenance of a farm; provided, that the combined weight of the trailer and its load is not in excess of 36,000 pounds, nor more than 10,000 pounds per axle, whichever is less.