Unfortunately it is at 3,800 pounds unloaded, so it is well over 4K with gear. Has around 450 pounds of tongue weight. I actually think that with proper weight distribution, the X3 would tow it safely (I have a prodigy brake controller on the X3), but would I'd have more trouble keeping with the flow of traffic on mountain passes for sure.

Our X3 has towed a 3,000 pound camper in the past and it was well balanced and still returned decent mileage. Manual gearbox meant I could always keep it in the right rev range. Notably, even with a fair amount of tongue weight, the X3 barely sagged at all! In fact, ride comfort on my somewhat firm riding '04 is close to perfect when you load up the suspension with a substantial trailer! Remarkable vehicle.

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2016 GMC Sierra 2500 HD All-Terrain, Duramax 6.6

2011 X5M Alpine White/Sakhir Orange, Eucalyptus, Spare tire!, Comfort, Soft Close, Tech, Rear Climate, Individual dash, Individual Audio, HUD, DVD, USB, Cold.

Gone:
2008 4.8i
2005 X5 4.8is
2004 X5 4.4i Sport
2004 X3 3.0i 6MT
2002 M5