When just changing wheels/tires or rotating them, I often use two jackstands at one axle and floor jack at other end. IMHO, not a problem, as long as you are careful, don't get underneath the vehicle, and are aware that the floor jack can shift the balance point on the two jackstands when raising the other end. If you have never used a floor jack before, be aware that when the jack is raised, the saddle (part of jack that contacts underside of vehicle) will not rise in a straight vertical line. Because the lift arm of a floor jack pivots at the handle/pump end of the jack, the saddle will move toward the rear (handle end) of the jack as it rises. The higher you raise the jack, the further the saddle moves laterally. This can cause the jack stands to tilt toward the jack end and become unstable. If you are on a flat surface, and the wheels (if it has them) roll freely, then usually the jack will roll into the lift and not move the vehicle. But, if the surface is uneven, or the jack wheels don't roll freely, then you may have a problem.