I'm planning on buying this controller later this spring. eTrailer has it for cheaper: Tekonsha Prodigy RF Brake Controller - Proportional - Trailer Mounted Tekonsha Brake Controller 90250

I've got the hitch on the X5 already, but I also plan to tow my camper with my Toyota Tacoma. While this is more expensive than just having a regular Prodigy controller (which I've already got too), it will certainly be cheaper than having a brake controller wired into the X5. That, and I don't have to worry about a mounting spot inside the X5 (or the Tacoma for that matter....)

I'll then be able to just move the remote from vehicle to vehicle, depending on which one will be used to tow the camper.

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Scott
On Order: 2015 F15 X5 35i
Space Gray with Mocha Nappa Interior Design Pkg and fineline Oak trim
ZXD | ZCW | ZPP | 3AG | 456 | 4UB | 4U1 | 5DL | 688
To be Traded: 2010 E70 X5 35d
Alpine White on Black with Dark Bamboo trim
ZAP | ZCW | ZPP | ZPS | ZRC | ZTP | 322 | 328 | 330 | 386 | 4AZ | 4UB | 655 | 6FL | 6NF