Is an F150 considered a full size in this discussion or do we mean 3/4-1 tons?
Definitely !! Full size is the 150/250/350 Series. 1500/2500/3500.
What clouds the issue are the 450/550 and up truck sizes which are super sized rigs.
They fall someplace in no mans land, not quite a 600 or 6500, but definitely no longer a pickup.. altho they are just as easy to drive and luxurious as a pickup, but nothing like the older medium trucks which were all pure commercial work trucks.
This is somewhat beyond full size....