After spending 2 hours on line yesterday, I'm not surprised no one can answer this question. It seems to be some deep dark secret as to what comes with or without a 4Runner equipped or not equipped with the tow package. I'm going to cancel my viewing of this 4Runner because I don't want to find out that I've got to rip the entire interior apart to run wiring for towing.
Sorry, didn't see this until now. Look underneath the 4runner. I believe they all came with the 7 wire connector.
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My '07 did not have the factory hitch but it did have the factory 7 wire connector and the connecting block under the dash for the brake controller. I installed both myself (the hitch was a U Haul, brake controller was a Prodigy P2 that's on my Suburban now.
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One thing I noticed about the factory 7 pin connector was that the bolt-on hitch blocked it a bit so I had to disconnect the socket from the bracket that held it in place. No biggie, there's not enough wire for it to drag.