Flipping the axle voids warranty on a Winnebago 1706FB ??

Forst, do the spring hangers have adjustable holes? If not, then it is a pretty simple job to add new perches to the top of the axle tubes and then locate the axle under the spring pack. People do it all the time.
BTW, who told you it might void frame warrenty, since you will not be doing anything to the frame.