I have a 30' Jayco Jay flight. This is our first travel trailer. I recently leveled our trailer and when disconnected from my truck it rolled back about 2" and partially crushed my plastic wheel choc...
Just make sure you are depending on more than the X-chocks for your chocking. I have first hand experience with a tire slipping on an x-chock and our camper falling off the jack blocks as a result. Thank God no one was hurt.