Dometic toilet sloshes water unto floor

Had a Keystone TT with the bath in the back. Toilet set in the center. Always traveled with fresh water in the front mounted tank. No problem. Decided to tow without a lot of fresh water as some on here recomend due to weight issues. Toilet water sloshed out onto the floor and into the heater duct. Only thing I could think was that the fresh water acted as a damper for the uneven road sections. Lack of the damper causing porposing enough to throw the water out. Filled up the fresh water tank and it never happened again.

Just a thought. Worked for me.