I towed a trailer over the weekend and you cannot plugin the trailer lights if they are a diode type lighting system, they randomly go on & off. Aparrently the tailer has to have a special adapter box on it so the lights will work. I think the X5 idrive see's that theirs not enough volts being drawn as it brought up "check trailer lights" etc. on the dash readout and on my Heads-up display

So if you going to hire a trailer make sure it has old fashion light bulbs.

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X5 M50d White | 20" Rims | Adaptive Drive, Self-Lvl Susp | Act/Steer | HUD | Xenon, Adapt Lights | H-Beam Ast | Rear/Side Camera | Panorama S/roof | Auto Tailgate | Comfort, Active, Ventilated, Heating, Lumbar, Navada Perforated Leather Seats | Comfort Access | M-Steer Wheel w Pdle Shift |Sports 8-Speed | Active Crus Stop/Go | Proff Nav + TV, DAB | 16 Spk Ind Audio | USB |Internet-eMail-SMS-Apps | 4 Zone Air | Speed D/play | Towbar | 20% Tint | 5mm Castor Bushes | Yellow Calipers, Ceramic Pads |