The ONLY adjustments on Kwikee steps are cam-adjustments. They are concentric adjustments that are used to match the end of the step travel to the end of the motor limit. They have absolutely nothing to do with stability of the steps. They only way they could stabilize the steps is for them to be BEHIND the step side rails so that they would SUPPORT the steps. Well, the only way for them to do that would be for the steps to pass them up while extending and then sit on them at the end of travel. That's not what happens.
The step motor and gear box have a limited travel. Those cam adjustments, when adjusted correctly, will match the stop point of the motor and gear box. What that does is, provides additional stops so that the motor does not drive the gear box gears any further and therefore could cause potential damage to them. It's happened to many on here, including mine.
As has been stated, several times, the only real way for the steps to be ridged is for them to me mounted on something that is ridged in the first place. If one has the ability, the tools, the fabrication skills etc. needed for a bolstering of the mounting system, then you will have ridged, non-spongy steps.
I know the OP stated he wanted a permanent fix to this situation. Well, the only way for this to happen is if he climbs underneath the coach and, inspects just what kind of action is happening while someone else steps up and down on the last (or first step from the ground)and see just EXACTLY what is flexing, be it the mounting structure or, the step paralleling arms themselves. I strongly suspect its the mounting system.
Until a permanent remedy is put into place, while the OP might not be too interested in doing it, I strongly suggest using an adjustable step support to help provide stability to that entire structure so that no more potential damage can occur. Yes, this needs to be done each and every time you setup for base camp and, yes it can cause damage if, IF, one forgets that step saver is there and either turns the ignition key on and closes the door or, has the door closed and starts the coach, same thing.
I have a warning tag on my steering wheel that warns me of the step saver in place. That way I'm reminded of it when I either need to make leveling adjustments (rare) or, we're ready to depart. It takes about 5-10 second to place that step saver under the steps, when the leveling is completed and, about the same to remove it when we're heading out.
Scott
Scott and Karla SDFD RETIRED2004 Itasca Horizon, 36GD Slate Blue 330 CAT
2011 GMC Sierra 1500 Ext Cab 4x4 Toad
2008 Caliente Red LVL II GL 1800 Goldwing KI60ND