Donna,
What exactly is bouncing? Do you mean the whole cab because it is on air-ride or do you mean that you personally are being bounced? If it is the air-ride, you should be able to have the pressure adjusted, ask the dealer if it is possible to do this, before you purchase. Normally this sort of problem is a combination of spring rates and shock absorbers and can be quite difficult to get correct. Have them check tire pressures as they may have been set too high for the load they are carrying.
I would imagine that the seat bases can be moved back as long as there is sufficient space behind for the seat to go back and still recline. Would need the mounting holes redrilled in the floor, another job for the dealer to research into to make sure the new holes do not affect other pieces of equipment, etc.
When spending such a large sum of money, you should be happy with all aspects of the vehicle, especially the driving part as some/most owners consider this as the best part.
Peter.
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