You will always get some motion on something that's supported by wheels and springs. The stabilizers are just that, they aren't support legs. You don't say if you're on grass, gravel, or pavement.
That being said, here's a couple suggestions.
* Use treated 2x6 blocks under the stabilizers and tongue jack. I know--the lego blocks work, but I put a 2x6 on the ground then use the lego blocks. It distributes the weight better than just the legos and doesn't dig into the ground.
The X chocks can and do help with front to back motion, but not side to side wobble.
* put scissor jacks, one on each side under the frame member, (put this on a 2x6 and also another wood block between the jack and frame). One under the frame where the front of the slide is (by the front grey water discharge handle) and one just in front of the door, under the hall by the bathroom door. These are not expensive and quick to set up and take down. Of course it depends how long you're going to stay and how bad the shake is. I had a pair of old railroad car jacks I got at an auction about 20 years that work great.
* check to make sure that the front weight is borne by the tongue jack and not the front stabilizers.
Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2010 F250 Super Duty
1992 Goldwing Aspencade