I have X Chock's between the wheels, and a set of JT Strong Arm Jack Stabilizers, which I haven't installed yet.
I hear great things about the stabilizers.
2012 Jayco Eagle 365BHS
2012 Silverado 2500HD CC Z71 Duramax/Allison
Curt Q20 Hitch with Roller
Firestone Ride-Rite Air Springs