Auxiliary power units reduce the need to run truck engines on idle…
But one disadvantage is that these units usually weigh several hundred pounds
Source: Go By Truck by Staff
Auxiliary power units reduce the need to run truck engines on idle while parked and are commonly used by truck drivers to limit their fuel consumption. But one disadvantage is that these units usually weigh several hundred pounds and could be a possible problem for drivers who frequently operate near the maximum weight limits.
Lawmakers addressed the issue by allowing for additional weight for trucks that have APUs. The 2012 highway bill, Moving Ahead for Progress in the 21st Century, expanded that weight tolerance to 550 pounds. Individual states, however, have opted to implement and enforce the additional weight exemption in different ways. Some are still using the older 400-pound exemption, and some do not have official laws on the books but do have enforcement policies for either the 400- or 550-pound exemption. And a few aren’t allowing for excess weight due to APUs at all. …(read more)
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