I have the jacks that came mounted on my Shockwave toy hauler. Whenever we loaded our trike or had a group of adults, our TT would always shake.
I ordered a couple of these:
Amazon.com: Valterra 020106 RV Stabilizer: Automotive
I placed one on the back of our TT and one under the steps (both under the fame) Our TT no longer moves at all, but our steps into the camper are a lot more stable.
We even ordered an extra one to support one of the fold out beds when we have an adult sleeping on it.