Is this mh new to you? Have you driven one previously? Typically, it's a driver error by over steering. However, being 11 years old, you could have some bushings and other parts that are worn and need replacing. Also, steering stabilizers are made to fit your rig and I'm sure would help immensely.
Ron & Sandie
2013 Tiffin Phaeton 42LH Cummins ISL 400hp
Toad: 2011 GMC Terrain SLT2
Tow Bar: Sterling AT
Toad Brakes: Unified by U.S. Gear
TPMS: Pressure Pro
Member of: GS, FMCA, Allegro
RETIRED!! How sweet it is....