When I watched the video, I ran across another video by the same dealer that explained a little further. I didn't know there was a progression of stabilizers to try on the market. If there is a wiggle you can't live with once the house is on it's scissor jacks and landing gear, you are supposed to try x-chocks. If that doesn't work, you are supposed to try locking arm stabilizers, I think they were called. I decided to give the plastic x-chocks one more try since we are on concrete and nearly perfectly level. I didn't feel much wiggle in the rear of the RV, but the front of the RV still had quite a bit of shimmy. I put the trapezoid stabilizers on the frame as explained in the directions, and there is no more wiggle at all. Now, I feel much safer. I wish I had done this sooner, but my husband and I are new to RVing and just didn't even know enough to know what to ask. When we first started full-timing, I had a problem with a swimming head if someone walked across the floor. Even our two little dogs would make the house shake. No more of that now. Thanks for all the help, everybody.