To stop the movement on my 34' TT I started with the xchocks and it did help. I then used the 'stack jacks' which really helped but I needed extra wood under them so they did not go into the ground and also needed to get under the TT to place them. A real pain.
The solution I now use with great success is the x-chocks and an extra pair of stabilizers placed just in front of the dual tires. This has stopped almost all of the flex in the frame and also the bounce in the suspension.
I think the cost of both will be where you end up but if you want the stack jacks I'll be glad to sell them as they are now just sitting in the garage so I don't haul the weight around.