Interesting thought though... Even if the Semi has 4x the cells of the CT, the Semi is supposed to be fully laden fir the 621 range. So even if the CT is “only” towing a 14,000 lb trailer there should be plenty of range available.
Not only is the Semi wider & longer than Cybertruck, but the Semi is much taller with the driver area much higher above the roadway.
There could be two or three layers of battery in the Semi.