Yes, the HWH air levelling has an auto level function. It can also be raised or lowered and moved at a low speed. The raise and dump buttons are momentary, so you have to keep your finger pressed on them while you move. As soon as you release the button it returns to travel ride height. Here is the excerpt from the HWH manual that pertains to this function:
Is there a use case you have, where you need to raise it?
Awesome on the 2003 Signature! Beautiful coach. Hope it works out, always nice to have another Sig owner on the forum
All the best,