Gillig is headquartered in Fremont, CA next to the San Mateo Bridge. They exclusively manufacture intra-city transit buses today.
They will respond to telephone support requests. The Gillig chassis used by Country Coach which we have seems to be very durable and provide a great over-the-road type bus ride.
In 1997, Gillig Bus dropped the MH market and I am given to understand that CC built their proprietary chassis modeled on the Gillig chassis.
Most of our travel is in the Western US. Frequently we travel from 840' to 7000' elevation in about 70 miles.
On steep grades, we travel at 35 mph max while towing 4,500 lb Jeeps or boat. The MH weighs 31,000 lbs loaded so we are below the 100:1 suggested pounds to HP ratio. (Note: most cars travel only 45 mph on that same road.) On four lane roads, folks can opt to pass around us.
We have enjoyed our rig for 8+ years using the 8.3L Cummins 300 HP engine.
But, we do have to suppress our envy for a couple of minutes when some MH's pass us on long grades in a fog of fuel.
Country Coach did put undersized tires on our vintage rig which requires running the front tires at near max tire pressure to carry the load.
As to which chassis is best, we opted specifically for the Gillig because it is a bus chassis, still in the bus business, and at the time, not a knock off chassis newly created by Country Coach. Since that time, their proprietary chassis has proved itself worthy.