Hi Zorba, Welcome!
You ask many good questions. I will try to be brief in my answers. Remember that we own a 2007 2350 (2007 Ford chassis too), bought new in 2007.
Model 2552 was introdced in 2011 or 2012 so you won't find one older.
Way over-kill to have 2 a/c units, might be beneficial only for zone cooling in the longest of PCs, not the 2552. With well insulated walls & ceiling, and double pane windows, two a/c units is a waste of money and introduces one more large hole in your roof.
We have cherry cabinets because my wife wanted them. I do like them, but the interior is darker from them. Just expect that draw back.
100% agree with double pane windows. We have them and love them.
Power awning was introduced in 2009 or 2010. I have the older box awning. For as often as we use it fully opened, it's fine, though admittedly is some work compared to pushing a button. What I like about ours is the lack of tracks on the side of our rig. I see that being it's only good point.
Swivel seat(s) are optional, so are power seats. My wife and I love our power driver seat and pasenger swivel seat. The driver seat accomodates my 5'11" body, and her 5'-1" body. Each can make the seat the height best for them, and also make significant changes while driving. I love to take advantage of the 6-way adjustments to change my weight distribution to squeeze in an extra hour of drive time. I would be in torture if I couldn't do that.
With the 3rd seat (the one behind the passenger), the passenger swivel seat is nice having guests when parked. It does not have the 6-way adjustments, but while driving the passenger can do many other position changes to take care of extended sitting times. We like our decision on seat stuff.
I wished I thought of 270 degree docking lights when we ordered ours. I later considered installing them, but dropped the idea because it was too evassive to retro-fit.
Just about everyone thinks differently then me about the ladder and roof rack. They all like it or love it. I asked ours be placed inside in pieces, and so it is stored in my basement at home. 5 years and so far I have no regrets, but I do have all the parts in-case I change my mind.
Folding bikes won't fit inside the rear compartment. The rear hitch you think you won't utilize, you will for a bike rack.
A few PC owners have gotten serious with solar panels up-top, one person did a real nice job of it. He had the antenna mounted rearward so he could place the panels nicely.
Me being the odd ball, I wished we never had an antenna at all. With digital technology, and the remote places we travel, we can't utilize it. We watch movies on DVD and use RV park cable service (the few times we've stayed in RV parks).
One of my main regrets is not getting the leather dinette seating. Our cloth makes sliding in and out from the dinette a bit of a chore. We got leather everywhere else, thinking the cloth would be a nice accent
as seen here. It does accent nicely but surely not worth the hassle. The leather wipes up nicely too. Not so with cloth.
Ask PC-USA if they will custom build a 2552 on an F450 diesel pickup chassis. They may do it for you at a minimal charge over cost. They are one of the few RV manufactures who are positioned to do such special requests. That is how the 2552 and the 4x4 option both came to be. Somebody asked if they would be willing to do it for them.