Hi parkgt,
We have a 10 foot door in a brick house with a second floor above as shown so making the door taller was not realistic. The finished opening when considering the 3/4" rubber-flap weather strip thingy is 9' 11-1/4". Our PC-2350 built on a 2007-E350 chassis, was built to the advertised spec of 9'-10". This is with the rig emptied out and NO fresh or waste water, but with a full tank of gasoline. The rig sits lower in the rear once fully loaded and ready to leave on a trip.
Back in 2007 before we picked it up from the factory, I had all kinds of nightmares on what to do if the rig was built out of spec on the high side. These ideas of lowering the rig came to mind.
1) Take air out of the tires.
2) Keep a full tank of fresh water inside. My FW tank is against the rear wall for maximum effect.
3) Remove a section of the garage door weather-strip and wood frame for the a/c unit to clear, then mount a floor brush to keep birds out and heat in.
4) Remove a pair of rear leaf springs, then add rear air bags to adjust it back to the right height once the rig is outside.
When we got our new rig home that day in June 2007, I was greatly relieved that all was well.
Model 2552 will be 10'-1" if built to spec. I see this as being 2" too tall. #4 may be your best option. Fortunately model 2552 has some extra rear axle load margin so I think it could afford to give up a pair of leaf springs and be done. I would first try that to lower the over-all height, then add rear air bags later if needed. Weighing the rig during a trip will determine much.
Of coarse my advise on removing a pair of rear leaf springs on model 2552 is unproven.....only theoretical.

Now about the front end. I am including this primarily for 2100, 2350, and 2351 owners but it "might" also apply on models 2551 and 2552. Click on the link below to see what I did with our front coil springs to soften the ride up front which also lowered the front by 1-1/4".
https://forum.phoenixusarv.com/index.php?topic=4168.0