always buy a pair. doing only one side won't be worth the expense.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
Yeah I just got the X chocks as a christmas present. Haven't used them yet but will be next week hopefully! To eliminate the movement while camping do what bikendan suggests and go with 2. You'll still have movement if you only chock the one side.
We use a pr of Bal wheel locks and still had a little movement until I installed a scissor jack on each side of the 2 x 4 cross tube in front of the front axle. That stopped the movement entirely. These jacks remain on the trailer during towing and are welded to a bracket that is bolted to the tube.