We have enjoyed a 1995 Gillig Chassis for the past 9 years and 60,000 miles.
The only support I have needed from Gillig so far is determining the Gross Combined Weight Rating. Gillig is still building buses in Hayward, Ca.
The ride is soft and handling good, but I have no comparison to the Spartan Chassis to offer.
At that vintage, one was a Truck chassis and the other a Bus chassis in my view.
Our rig has a Cummins engine and a PowerTech diesel generator. Both work fine.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs