BTW, LVP - I installed the Tekonsha Prodigy RF on our new horse trailer. With OEM hitch electronics and upgraded software on my E53, installation and 'mating' the sending unit to the 'power' unit on the trailer was seamless. No need to first do it on a US vehicle. The only glitch, at the start, was the sending unit displaying 'nc' (not connected) when I first connected the power unit to the E53's seven-prong hitch. It was, in fact, connected, and dialed up otherwise without a problem. I'll now try it with the trailer on the CEO's ML350 bluetec, which has lower hitch and higher tongue/weight capacity than the E53.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.