Auxiliary power units (APU) are one of the best weapons truck drivers can have against wasting fuel.
They make it possible to power a truck’s heating, air conditioning and other comfort systems without the need to keep the engine idling during rest stops. While they are very beneficial by not wasting fuel, the additional weight can cause problems. With an APU weighing several hundred pounds, they can push a truck hauling its maximum weight limit over the line into non-compliance, depending on where truckers are driving.
When former President Obama signed the 2012 MAP-21 bill into legislation, many states began to rethink their policies regarding trailer weight limits. While some states have specific laws outlining their exact tolerance policies, others do not. Because of this, it can be difficult to keep each state’s policies straight.
The following table displays state-by-state APU Weight Exemptions.
APU Exemption Guide by Track Your Truck
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