Pay close attention to the details for which our Lightning BEV's might qualify.
GVWR is just above the threshold for vehicle class 2b rating if your truck has an ER battery
I know you scored a PRO with SR battery, have you considered bumping up to XLT-ER or Lariat-ER, those models would qualify you for the Mass MOR-EV-Truck credit which is worth $7500, but spending a lot more on the truck to get it needs to be considered as well.