One of the big things that helps stability is not extending the jacks way down like shown. If you can place a stack of blocks on the ground first and build up the height first this will help.
You do not mention what you have for a TT. Looks as if you have dual axles, placing a X-Chock between the wheels will help. Adding a third stabilizer right in front of the axles will help take the bounce out of the frame.
Few hours after setting up or maybe the next morning, I will tighten up my stabilizers and X-Chock, this makes a big difference.
2012 Jayco X23B
2020 Ram Laramie 3500 SRW Air ride 50Gal fuel tank.
2007 Dodge Dakota Quad Cab (retired from towing)
Equal-I-zer 4-Point Sway Control