"Full size". For anyone actually needing to haul shit in the bed it's missing ~6 cubic feet of space from the smallest bed size of an F-150 and around 30 cubic feet of usable bed space from a long bed Silverado. It's also missing about 2000lbs of towing capacity. The Lightning has slightly less towing capacity but more room in the bed for your stuff.
These were never going to be used for the same thing a working truck would be used for. It was going to be another big ass parking lot princess and it was always going to take up as much or more room than a full size truck for less usability.