Any rver knows the importance of wheel chocks. We absolutely admit to the irrational fear of simply rolling away while we slept, waking up in a completely different campsite, when we first started rving. Who would think that these little, affordable plastic guys would keep thousands of pounds of travel trailer in place? We certainly didn't! But (fortunately) they do.
This wheel chock by Valterra Products, Inc. will do a fine job. They have grooves on top and bottom for a great grip, a nylon cord for easier removal...and you can sleep better knowing you will wake up in the same site in the morning!
One last hint - be sure to order at least two - they are sold individually. Sweet dreams!