In all the literature I've read Lippert seams to lean towards lifting the rig by the frame as being a bad idea. Now they aren't stupid and most of the time they avoid lawsuits by eliminating all possibilities rather than a few exceptions. Your RV is only designed to be lifted by the suspension. The rear stabilizers simple stabilize and the front landing gear allow the unit to be leveled as well as getting the TV under the pin box. Neither of them are actually lifting, only offsetting weight distribution, same as you lifting the front of your car, you can move it vertically (small amount) but you aren't lifting it.
It would be considerably more difficult to attempt to support the unit on jack stands alone. One the frame isn't designed with any jack points meaning you could risk damaging the frame. You could increase the amount of jacks to offset the weight, like a mobile home, but then you are increasing the difficulty in getting the unit off its wheels. Also remember that the suspension is loaded right now, if you lift by the frame it will begin to unload, meaning you will have to lift it considerably farther to get the wheels off the ground. Right now, all you need is a 20 ton bottle jack and some 6 ton jack stands, and one inch of vertical movement.
Best of luck