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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.

Korean Jumbo Taxi

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.

http://airjumbo.co.kr/english/company-english.htm
http://www.ijumbotaxi.com/
http://www.kltaxi.com/eng/html/greeting.asp

* Caution :
Make sure, check the words Jumbo Taxi written on the sides.

Van Taxi is not Jumbo Taxi

(The right side is not Jumbo Taxi)
Van taxi, Taxi Van … are not taxi, They will charge a lot of fare, so becareful