[Edit: I originally cited 280cm as the wheelbase cut-off from [1], but on a re-read, it's more complicated; see below.]
The best-selling vehicles:
F-series pickup[2]: 392cm
Dodge Ram[3]: 367cm
Chevy Silverado[4]: 373cm
Correction/Edit: The relevant definition for a light truck is based on a number of criteria which relate to the wheelbase but don't actually specify it. If someone wants a fun trig problem, you could determine whether these vehicles are designed to be just long enough to satisfy the requirements listed here [5].
[1] https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/p...
[2] https://www.caranddriver.com/ford/f-150
[3] https://carsauthority.com/2023-dodge-ram/#:~:text=2023%20Dod....
[4] https://www.caranddriver.com/chevrolet/silverado-1500/specs/...
[5] https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/p...