Our Power Gear jacks work the exact same way. Ours are designed that way . Instructions for our jacks say, dump the air bags, raise the front of the coach a couple of inches with the front jacks, then level front to back, left or right with the back jacks. The reason to lift the front jacks a bit is to allow them to adjust to the back jacks right or left movement. This procedure will not bend the frame. I suspect yours might work the same way.
Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))
2003 Fleetwood Expedition 38N 2005 Saturn Vue