Joe,
You ask if all coaches are that way. Not really. A 45 foot diesel with independent front suspension and a tag axle will be very different from a 29 foot gas coach.
I had an Alpine Coach that would actually move the semi tractors a little when I passed them. It was extremely stable in all but stupid windy conditions. When you came out of an overpass you only hardly felt a decent cross wind.
Great coach for two people. Terrible layout when the kids and their families want to travel with you.
I now have a 37 foot gas camper that has air bags front and rear. It drives and rides good. Not as good as the Alpine, but nice for a gas. You can improve your coach immensely, but it will always be a short chassis and therefore subject to more movement.
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