Ann,
I have a well pump too, and I am running my RO system off of a 100-foot (or more) line run underground from the house the the GH, so my pressure there is much lower.
With lower pressure water, you'll get less output from a system, but it will still work. (RO system capacities are usually rated at "X" gpd @ 70°F and 60 psi. Lower temperatures and less pressure decreases the output.) However, if you run your softened water to the RO system, it will actually work more efficiently, as Na ions are easy to block, and don't clog the membrane as quickly and Ca, Mg, and Fe.
Keep in mind that RO is not an "on-demand" system; you'll still want to use it to refill your tanks, just like the rainwater.
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