Portugal - Cali classification - Classe 1 or 2? 2

[T64ME]

Quick question - crossed into Portugal a week ago from Spain and noticed the Cali been categorised as "Classe 2" [when signed up for Easytoll] which incurs about double the Toll fare v Classe 1. Is this the correct classification ? I'm driving a T6 Ocean with 4 seats.

I don't mind paying the expensive tolls ......but want to check not overpaying !!

Many thanks

David