Richard
The earlier Magnum chassis were built with only 2 shocks per axle which stressed the shock mounts heavily on the front the rears seemed to be ok
These coaches suffered from proposing which worked the front shocks too hard, the shorter the coach the worse the proposing.
Some where in the mid 1997 model year Safari moved the front shocks and add another 2 for a count of four shocks to the front axle by 1999 they had done the same to the rear axle this was done in an effort to try and reduce rebound on dips and control proposing . Although it helped it did not fix the problem
The problem is that the rear mounted engine works as a cantilever being behind the this is why the shorter/lighter coaches suffered the worst from it
Years ago there was talk about adding extra weight to the front of these coaches to help and I'm sure it did but today there is a simple if not cheap fix for the proposing by adding MCUs ( motion control units ) to the air lines feeding each air bag ,this controls the air movement going into or out of the air bags by limiting its velocity's and eliminates the proposing.
On my 40 ft coach I only installed the MCUs on the front four air bags and it completely cured the proposing
Super Steer calls for one for every air bag both front and rear but mine worked out well only doing the fronts.
The MCUs are sold by SuperSteer and are. Sold by Hendersons in grants pass.
You'll have to confirm your air line size but I think these are the right ones
You simply cut the air line as near the air bag as you can within a foot is good and insert the MCU into the line they have push to fit connections
https://supersteerparts.com/products/supersteer-sse5065-motion-control-unit-3-8-over-30-000-gvwr.htmlIt's also a good idea to weigh your coach and adjust the tire pressures according to the tire load chart for that tire.
If your up for a noticable difference in ride the Koni FDS shocks make a difference as well helping get rid of some of the harshness on expansion joints
While your under there check your front shock mounts at the frame they sometimes will have cracked the frame around their bolt mounting holes in the frame.
Hope this helps
Eric