tires? trailer will sit after move

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We just purchased a 1976 Sovereign Land-Yacht International 32" that is sitting about a five hour drive away. The trailer was towed to its current location about two year ago, and before that it sat on the coast of Washington for two years. We plan to live in the trailer as we remodel our house. We have a lot of the records from the previous owners, including information about the tires. Notes from a previous owner indicate that new front tires were installed in 1992 and an almost new front right tire was installed in 1993. There is no information about the other rear tire - I presume it's really old. What should we do about tires? We need to do whatever we plan to do soon to move it up to our place. Should we buy used tires? We're near Seattle and there are quite a few used tire dealers. If we buy tires up here, I'm not sure how we'll get the tires on the wheels and installed. The trailer is near Portland.

We won't be moving the trailer once we put it in place - assuming we can get it down our narrow, twisting, up and down driveway . . . but that's a whole different problem.

Any advice would be greatly appreciated.