The Krystal Koach Limo Bus is Built on one of three basic truck chassis: the Ford Commercial Truck.  The Krystal Koach Limo Bus comes in four different size models; KK28LS, KK33LS, KK35LS & KK38LS with various layouts.
Bus product line, ranging in size and seating capacity from 14 to 28 passengers, and built on one of three base truck chassis: the Ford Commercial Truck: E-450, the Ford F-550,(The Ford F550 is a class 5 Ford conventional truck) or the International 3200, buses 3200 and 3400, built on International Truck and Engine Corporation. 

From the editor

Although they are beautiful to look at they are not so comfortable to ride in.  We hope that some day they will build them on a bus chassis rather then a truck chassis this will give it a much needed and better ride. As it stand now they are built on a truck chassis and we all know what a commercial truck rides like.  (as you can see by looking at the shape of the front end.  It clearly shows that it is a Limo Truck NOT Limo Bus like they claim)