Does it have hydraulic leveling jacks? If so, those help. Some of us have added those trailer-type stabilizers, but it's really hard to get them out to the corners and still be able to keep them out of the way for travel.
Tell you what really helps: Heavy Duty Front and Rear Sway Bars! They improve handling on the road, but that extra roll stiffness shows up big time on the campsite. There are two major brands: Roadmaster and Hellwig. They are the SAME Steel and the SAME specs. Both use hard poly bushings. Difference is you can buy Hellwig for about half the price of Roadmaster.
A gas coach leaves most of its weight on the suspension, even with hydraulic levelers. Ours is about as steady with the new sway bars as it was with the leveling jacks down. Together, a little steadier yet. Most of us feel that our coaches sit OK. That said, they are not as steady as a trailer with jacks placed right out at the corners. If you need that with Class C, I'd suggest a set of those jackstand-style that you carry with you and set up once you're parked.
