There should be a suspension switch somewhere on the center console, just select the normal ride height. Unless the suspension is faulty, the ride height will automatically reduce to 'normal' once any speed over about 15mph is reached.
Make sure the key lock under the rear window is turned to the door unlock position ,not the glass unlock position.
It has the air ride suspension and you have a leak somewhere in the system. You will have to find and repair the leak.
On my '02' Expedition the rear actuator went up leaving the door stuck in the locked position, the key nor the key fob would unlock the door. I had to get a locksmith to unlock the door to get the rear panel off then take it in to get the actuator replaced. If this is your problem then if you get a locksmith to unlock the rear door, make sure you take the panel off so you can unlock it from inside.
Independent rear suspension.
They are the rubber mountings located on a vehicles rear suspension on wich the suspension components pivot, giving softness and elasticity to the suspension movement.
Dual suspension is a bicycle with both a suspension fork and a suspension rear. A rigid bike is a bike w/o any suspension, both fork and rear triangle are stiff.
Typically, E350 have a leaf spring style rear suspension
If it's independent rear suspension, it's been knocked out of alignment. Yes, rear suspension can be knocked out of alignment.
Nozzle to fill rear suspension manually 98 navtigator
MuscleCar - 2001 Rear Suspension Options was released on: USA: September 2007
The rattle could be caused by loose bolts or worn suspension parts. The rear suspension should be checked to insure that no parts are close to breaking.
depending on what model you have it is usually on the rear suspension frame.