Hey guys - I think I'm going to buy the OE hitch, and I have several questions:

1. What's a good online source and what should I expect to pay?
2. Which pieces do I need? (Hitch, Ball/Tongue, and Wiring Harness?)
3. If I get the wiring harness does that also give me trailer brake control, or do I need a separate brake controller unit?
4. How long will the DIY install take (give or take)?
5. Any words of wisdom/caution?

Thanks!

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2002 X5 3.0i