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Originally Posted by Czechitout
1. Would it be better to buy a generator, and if so, how big (31 foot trailer)
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Check generator prices. Considering maintenance and fuel expense, and the fact that you cannot leave the generator running for a week at a time unattended to power things like the fridge, you might find that the $4000 is a pretty good deal.
Generators are loud and are mechanical devices that are prone to failures.
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2. If we do install a power pole, what is the maximum length of an extension cord can I run from the airstream? The power cord attached to the rv is about 15 feet.
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In practice you'll find that you can go up to around 50 feet or so with standard sized wire. Anything beyond that and you have to increase wire sizes to avoid voltage drop, and it becomes less and less practical. Consider that a cord left outside year around will only last 5 years or so.
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3. I have searched the paperwork and cannot determine whether this is a 25, 35, or 50 amp power system.
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Your 1972 would have come with 30 amp service from the factory.
It is possible, though unlikely, that someone replaced it with 50 amp service at some point, especially if you have dual air conditioners.