Comment by prmoustache

It varies a lot by country.

In my experience in west europe, booking a uber XL you usually get a full size van (vw caravelle/multivan, Mercedes v-class or a bigger Renault Trafic) with usually 7 to available seats.

Booking a uberXL in Mexico City gets you a miniSUV with only 4 available seats and if you get too much checked luggage it goes on a roof rack.