Jumbo Taxis, Korean call it Daehyeong Taxi.
maximum passengers is 8.
If you have a lot of baggage, or you are with company, Jumbo taxis will be good choice.
Fares are the same as deluxe taxis.
I found several website of Jumbo taxi driver, but usually they does not support English.
The below websites support English.
* Caution :
Make sure, check the words Jumbo Taxi written on the sides.
(The right side is not Jumbo Taxi)
Van taxi, Taxi Van … are not taxi, They will charge a lot of fare, so becareful