Double-check your jack stand ratings. Sometimes jack stands are rated per pair, not per stand, so a "6-ton" set of jack stands is really two three-ton rated stands. Granted, one corner of a typical class C should not be three tons...but it's starting to get close, and if you're positioning it towards the center or overloaded somewhat or the wind is blowing hard, it's possible things could get ugly.
If you aren't going to be underneath the RV while it is lifted, but only changing a tire or something like that which you can do next to it, then the jack stand is arguably not essential equipment.
