Well, you can look at the document archive on the Airstream site and see what your trailer was originally equipped with. A quick check shows that your furnace was a 22,500 BTU, but a couple of years later they were building them with a 30,000 BTU unit. Part of the decision is figuring out what will fit in the space you have for your furnace. You might not be able to fit a 30k unit in the space you have.
For the AC, get the highest BTU rating you can get, and I mean 15,000 BTU. You might get by with something less, but I doubt you will ever regret maxing it out.
good luck!
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