Bear Lake State Park Check-in - East Beach Campground! 

Try some RV snap on pads they fit like shoes on the stabilizers ,the blocks you’re using look too tall ,probably throws the system out ,having the wheels off the ground is okay but not ideal .Lovely spot to camp

Go to Home Depot, tell them to cut for you four pieces of plywood 1/8 thickness. Paint them for protection against water and heat. Done.