2. Always check your holding tank drain hose connection before you dump your tanks. Dump site owners and other RVers will appreciate it.
3. Dump your black water tank first, then grey. Being sure to close the black water valve before you dump the grey. See number 2. Also, always replace the little cap over the end of the dump tube.
4. Always check your mirrors.
5. The rig is bigger than you think, even if it's smaller than the big ones, always look ahead, and avoid tight parking lots.
6. Make sure all slides are in and locked, all cabinets are closed, sliding doors and shower doors are latched.
7. Even the best rigs get less than 10 MPG in most cases, so plan fuel stops accordingly. Know your limits.
8. Never put heavy things in the overhead cabinets. Canned goods, ammo, water jugs, etc... should be at the floor level. We know of someone who stocked their upper cabinets with canned goods. A few miles and several large bumps in the road later, those upper cabinets collapsed.
They aren't like your pantry.
Assuming your class C is a Ford Triton V-10, check the oil daily if you're doing a lot of hill climbing. Have fun. If you're driving along I-40, stop in Albuquerque and have yourself a green-chile burger.
All of the above and...
INCREASE your gap in traffic between you and them cars in front. BRAKING distances are YUUUUUGE!!