You can do something to lower the height of an E450 PC, but I would limit my suggestion to models 2551 and 2552. That is to take the PC to a trusted truck suspension shop and have them remove a leaf spring (or two) on each rear corner. Doing so will reduce your height and soften your rear suspension along with reducing your payload. I feel there are no worries in doing so with models 2551 and 2552 because you can afford to drop a little of payload capability. And you might actually appreciate the softer ride.
The right truck shop who knows what they are doing would be able to determine exactly how many leaf springs he can remove to reduce the height.
I dont know about a 'Trusted' shop, but any legally operating, insured truck shop should be VERY hesitant to go removing leaves from leaf spring packs. ESPECIALLY in an RV. To over simplify, the lengths of the leaves are taken into account to distribute the forces correctly across the main leaf. Likewise with the spring rate. The suspension is an engineered system that covers a LOT more than just how high the coach sits.
Want a softer ride and height adjustability? The right way is to go with an engineered system, not hacking away at things until it looks right in the driveway.
https://liquidspring.com/ford-e-450-rv-suspension/ Features ""
on-demand kneeling.""
It does cost more to do it right. For good reason. Bet they paid a large sum of money to get it DOT certified. But unless you are operating this rig on your private roads, you are responsible for operating a SAFE motor vehicle. Shadetree hacks to the suspension are not a responsible thing to operate when others lives are in the balance.
On that thought... I wish you miles of safe motoring, but should an accident occur, and a lawyer find that non-certified/non-approved modifications were done on your coach... you may lose a LOT more money than it costs to do it right the first time. We live in a very litigious society. A responsible shop will be aware of this also, and not want to assume the liability.
My two cents. Others will disagree, I invite other opinions on what a safe, legal way to modify suspension would be.