If the jacks have lifted the coach they are carrying the weight. ALL of it. Period.
Jacks are solid, they should not rock.
Doing the bleeding procedure described above once is a good idea,just to be sure.
Our Monaco Powergear hydraulic 3 jack system) is very stable when properly jacked up.
One thing I've noticed.... when leveling side to side, sometimes the low side jack will lift the high side jack off the ground. Since the monaco structure is very stiff, it just sits there, on 2 jacks and one deflated pair of air bags on the low side rear. If I leave it like that, it will rock a little.
Once I achieve level, I always hit the low side rear button long enough to fell it hit solid, then hit the high side to re-level if I need to.
on the jacks, our coach is a rock. it doesn't move or wiggle ever.