1. The seat might be riding too close to either the top or bottom of its travel. It should "float" w/ road bumps, etc., not bounce.
2. Might need lower (higher number) rear gears. Remember, a CLass 8 truck will not accelerate like a high-powered pickup truck, no matter which engine you have (a 450 Mercedes is NO slouch!)
3. Normal for large trucks. Again, don't compare to car or pickup steering. The slow ratio allows for better control.
4. How slow or fast were you turning? It should return during highway-speed turns, but not nearly as well during parking-speed maneuvers.
5. Hey, it's a truck! No more, no less. Rear air ride should take out the rough spots but you will still feel the bumps without discomfort. Do not expect a luxury car ride; you will not get it from a vehicle designed to haul a 40-ton gross (truck AND load) weight. Plus, with tandem axles the ride WILL be rougher than a single axle, as your axle capacity is 40,000# for the tandem rather than just 20-23,000# for a single axle.
Does this help much?
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