Hello Pastor Norm,
If you see evidence of oil leaking down the casing of the shock absorber, then certainly they need to be replaced. Also, high mileage can be a good reason to replace them.
Regarding the alignment, it could be that the Safe T Plus steering control is no longer centered, so you have a chronic pull either to the left or the right. When you have the alignment checked, I would hope the technician doing the work will set the Safe T Plus where it should be, and he should be able to advise you of its condition.
As far as the anti-sway bars, the bushings holding them in-place can get worn, so perhaps you would benefit from new bushings. Do you see any air gaps in the bushings? Can you wiggle the anti-sway bars around with your hand? If so, then new bushings would be what you need.
The air shocks would be another thing I would ask your alignment technician about. If you do set their pressure, I'm sure you would have noticed if they leak-out. In looking at the
brochure from 2010, it appears that of the two floor plans, the larger 30C would tend to be more overloaded, as both have the same E-450 tonnage. I do like lifting bags better than air shocks.
Welcome to the forum.
Eagle5