Hello, I am portuguese and I made a reservation of a Ford Transit Wagon for until 15 people in Alamo, LA International Airport. You know if I can drive this type of vehicle with a normal portuguese driver`s licence?

It doesn't require truck or commercial endorsement.

Yes it'd consider normal car

Yes you will be fine

Yes you can.

But for such a big car it is enough a normal driver's licence or should be a licence for trucks?

Yes, EU licenses are ok. No need for an international one.