Fuel Surcharge???

A quotation received today for shipping some heavy countertop material by truck has a 17% "fuel surcharge". Huh? Diesel is at its lowest price since 2010. This is a 26% decrease from a year ago. If the trucking industry wants our sympathy when fuel prices are high it needs to reciprocate when prices are low.

source: https://ycharts.com/indicators/us_diesel_price