If you start scrolling back thru this same forum Roo/Shamrock, you will see a number of posts regarding replacing just the seals and replacing the bunk door. Some have did it themselves, others had it done. Keep going pretty far back.
You have a pre-2013 door with top locks which is different from the later models.
You will find that the shipping charge is what gets you, but again you will read ideas on how to get a door with a dealer shipment.
Have you thought about trying to harden the wood/laminate and maybe adding something to support the hinge area?
Although not specific to the bunk door, I have had good success using these two products around my home. The second picture of the 4 components include the 2 part epoxy wood substitute to fill in gaps in anything missing, while the liquid will harden soft wood areas. Use that in conjunction with the wood hardner.
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2014 Shamrock 183
2014 RAM 1500 Bighorn Crew Cab, HEMI, 3.21 gears, 8 Spd, 4X4 TST TPMS