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Actually, you can use a legacy receiver with a DISH Pro dish. An adapter is needed at the receiver to get the proper signal for that receiver.

No, Dish Pro is a stacked technology, which the older 3700 will not recognize.

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You can use it, but it can (and often does) cause the receiver and/or the LNB on the sat dish to malfunction.

RG59 wire is not thick enough to carry 18 volts from the sat receiver box to the dish and will eventually cause one or possible both of them to fry from lack of proper voltage.

Again, you can use it, but buying proper coaxial (RG6) will be much cheaper in the long run.