Just bought a pair of extended X-chocks. Installed them, and we noticed a big difference in the shaking/bouncing. All the recommendations I got before hand were positive--although one noted to be careful and not over tighten, snug is good!!!
I use one on the door side and it made a difference, but is tight to turn when not betweent the tires so i dont colasp to store. One did the job and elected not to put one on the opposite side, mostly in fear I would forget to remove it before trying to drive off