Just got back from 9 weeks in FL with the wife. I had the same problem with my Shamrock 183. WHile sitting outside and the wife moving around inside, I observed the wheels moving slighty to and fro even with wheel chocks.
I did a quick search of this forum and decided I will give this a try...
Wheel Chocks, Homemade - Dutchmen Owners
I would probably try to use wing nuts on the threaded ends.
I think I read somewhere that the X-type wheel lockers that they sell are a bit too large for the distance between the wheels on my rig, otherwise I might I would buy one of those.
I don't think I can elimante all movement because the hybrid bunk ends act as levers and would amplify any movement in the beds... but I think this fix should get rid of the rolling motion.