I use the fastway one step chocks. Yes, when the trailer levels the tire pull away from them but if you don't move them the tires will usually return to against them when you retract the rear jacks. I leave them in place when hitching and that does put more pressure on the front half and I have to pull the rear half free then pull forward just a hair to completely free them. The only problem I've ever had with them is the pull cable ends came off after a couple of uses, trip to hardware store for some cable fasteners and no problems since. I have been using them for 9 or 10 years now and would not go back to the old single chocks.
By the way X chocks are not to be used to stop a trailer from rolling and should not be installed until you are unhitched and level, and should be removed before retracting jacks and/or hitching up.
