I should have mentioned previously about the second set of shocks.

In the early to mid nineties when some converters were greatly exceeding the front axle weight limits Prevost made some changes that could be applied to all coaches.

One of the things they did was add a second set of front shocks. The principle behind this was not only to add more resistance to rebound so the heavy front end did not jounce, but also to resist allowing the coach to bottom on the front suspension after hitting a bump.

At about the same time they changed the front airbag size on production coaches, but also offered a retrofit larger airbag called "big Bertha". The larger airbag not only addressed the bottoming issue that was helped by the second set of shocks, but on some of the overweight coaches it was almost impossible to raise the front end, and the larger front bags overcame that problem as well.

I think if you are satisfied with the ride and have not had any trouble with your coach bottoming on the suspension then stay with whatever shock set up is on the coach. If it only has two shocks and you add the second set the ride might become too harsh.