On RV road trips you will occasionally run into strong wind gusts or dust storms. When crosswinds hit a large, flat object (the big, flat side of your RV), they may cause your vehicle to swerve. Drivers will sometimes oversteer or overcompensate in these kinds of conditions, which can compound the swerving.
Truckers suggest using one hand on the steering wheel to steer the coach in extremely heavy crosswinds to prevent oversteering. Keep the other hand lightly touching the steering wheel in preparation for emergencies.