This disclosure relates to a method for preparing alkyl lactate with high yield and high selectivity, comprising the step of reacting glycerol with water or alcohol in the presence of a catalyst. Plural vertically oriented sensing strips are affixed to a trailer’s hopper sidewall of the trailer’s hopper at spaced locations. The at least one other node, based on the broadcasted data packet, is to initiate a timer, the timer based on a time for a switch fabric manager for the switch fabric to indicate validity of the reset request to the at least one other node. A cam is mounted on the shaft, and a follower is mounted on the housing for selectively moving the pawl between the first and second positions when the shaft is axially displaced from its predetermined position.