That drop in range is further exacerbated by the car's thermal management system which uses its own electricity to warm the battery up for proper use. Throw the defroster, seat warmers ...
Don't confuse a slide-in range with a drop-in range, a type of stove integrated into the cabinet and lacking a bottom drawer.
Tesla’s answer was a yet-to-be-released drop-in range extender battery that would fit in the bed of the truck and extend the maximum driving distance on a full charge to roughly 500 miles.