Shock of sorbets for Jayco Discovery

Why..?

It has leaf springs I would assume..they generally provide their own friction to rebound in their design for moderate activities.

Adding shock absorbers may make the compression a lot harsher and shake the bejesus out of your Jayco.

16 ft is not a heavy van.

A properly-performing shock absorber should not offer any major increase in resistance to spring compression, or seriously increase jarring to the van.
Shock absorbers are designed to specifically prevent excessive rebound and unnecessary bouncing. Thus they compress easily but rebound slowly.

The biggest single problem with fitting shock absorbers to any caravan is that there's little room to fit the shock absorber in, and allow adequate shock absorber travel.

A lot of shock absorbers fitted to vans mount below the axle and thus provide increased potential for damage on rocks and obstructions.

If the manufacturer doesn't fit them originally (as standard or as an option), it's unlikely you'll be able to fit them now.
Essentially, a van has to be designed from the word go to accommodate the installation of shock absorbers.

Alko the supplier of suspensions to Jayco market an inexpensive bolt on shock absorber kit that would be ideal for a 16' van.
I would own a van without shock absorbers the difference is like chalk to cheese.
Try driving a can without them and see how it feels.
Ozjohn.