This website lets you download Holiday Rambler manuals, but I don't see a "model 252." It might be listed under another name, but until you select a model, you can't select a year, so I don't know if it goes back to 1973.
I don't know what information you're looking for, but most owner's manuals aren't very detailed and full of typical 'boilerplate' things like, "use your seatbelts and check your tire pressures." You can download a couple and get a good idea of what they say.
For information you can use, go through the RV and note the make and model of all installed items you find. Going back over 45 years is a stretch, but again, if you have a Coleman A/C, you can find information about them, if not your specific model.
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