Auxiliary power units (often referred to as APUs) eradicate the need to run truck engines on idle while parked and are frequently used by truck drivers to monitor fuel use. One disadvantage of these units is that they normally weigh several hundred pounds, and could be a problem for drivers who carry close to maximum weight limits. With the president’s latest expansion of the MAP-21 bill dealing with state-by-state APU regulations, this may be confusing to drivers who often cross state lines.
Below is a convenient guide, created by fleet tracking systems company Track Your Truck that notifies drivers just how much APU weight is exempt in each state.
APU Exemption Guide supplied by Track Your Truck