Exactly why I carry a boat load of lumber. I use the chocks in the photo below. Never had a problem. I have one on each side. I carry enough lumber to raise one side of the trailer 10 inches if I needed to. Tires are always on the ground, or on these boards.
I've never wanted to use those Roto-chocks for the very reason what happened to you. Chocks will always hold the trailer of moving. Let one of the tires spring a leak, and you get movement with Roto-chocks!
I once had my pop-up slide down a hill after it was set up. I even had the stablizer jacks down. But the tires were not chocked. After that event, my trailers are always chocked, even my utility trailer parked inside my garage is chocked both directions. Never again do I want my trailer to roll away!

