I'm going through the same issue with our Tracer 3200 BHT (not a toy hauler). I have the 4 stabilizers down, an X chock between the tires on one side, plus for other stabilizer jacks and when someone walks the TT still shake. Drives me nuts, I have 8 stabilizers on this thing and still moves like there's no jacks at all. But the odd thing is, when we bring it home and drop it, I can get it stabilized like a house with no problem with just the 4 corner stabilizers and the X tire chock.
2013 Prime Time Tracer 3200BHT
2016 GMC Crew Cab Duramax All Terrain
Ribs in the smoker and Whiskey in hand