Greg,

At one time the second set of shocks were added. As I recall it was to deal with converted coaches that had excessive weight on the front end that were experiencing rebound when going over bumps. If you have not had any bottoming of the suspension when going over bumps or undulations in the road I suspect you will not need that second set.

I think Hector's opinion of the problem may be on target and the simplest and fastest way to confirm that is to lube up the rollers and the S cam and go try a hard stop. They are likely to be easily accessed just by turning the front wheels fully left or right and using a mirror to see them.