My E53 gasser six with a 6 spd stick lacks the torque to be an ideal towing vehicle. I have towed approximately 4500-4800 lbs and have to do a lot of downshifting to 4th [even 3d] on rolling terrain. My experience with Ford trucks, supposedly 'comparably' powered [V-10 gasser vis. 7.3L V-8 diesel] was no comparison: the diesel's torque makes all the difference. I would 'hitch up' the diesel and be happy .....

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