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well, a 3Fd cap would handle a 3Kw amplifier.
I don't think you need more than that as I'd use one cap per amplifier..
that said, if you need more capacitance, they make bus bars to run parallel capacitors. you can string 3 together with a plate and have triple the capacitance without hurting the ESR.

Cool.

What I should have said was up to 3 farad using multiple caps for higher power systems.

Would having multiple capacitors draw much more than a single larger one? (for instance three 1 farads instead of a single 3 farad)

depends on the specs of the capacitors but within a small variance, they'd be about equal.. the three 1Fd caps might actually have considerably more capacity. It really comes down to comparing ESR, voltage and capacitance. the single 3Fd cap is going to be cheaper than three 1Fd caps though, if this is for a single amplifier.. and I don't think any difference between the two setups would be noticeable.
end result, go with the cheaper option.

In my conversations with RC, He told me that the main reason he used the caps was to absorb A\C ripple, the bad stuff that comes off the alterntor. Caps do a great job of this, but they were never supposed tobolster a system current capacity.