Check your load distribution. Most coaches handle better if the front axle is loaded close to maximum axle capacity.
Empty coaches will handle different but usually a loaded coach handles better.
Next you want to insure that your tire pressure is correct. This can only be determined if you weigh your coach when it is full loaded for travel and with all occupants in their seats. The adjust your tire pressure according to the Tire maker's specs.
Then you need to look for worn suspension components like bad shocks, etc.