If looking new, you can get the X3 with the tow hitch installed (which I have). We towed a Toyota Carolla loaded full of stuff from IL to Florida. Averaged about 22 mpg there and back. Car acted like it wasn't towing anything, still pulled hard and cruised in 8th.
I had a 2017 X1 that I put a Reese tow hitch on, but then again I didn't tow really heavy with it. I'm sure it could tow 2.5k lbs, but it would struggle to do it more than the X3 M40i did.
It's recommended to have a vehicle that's heavier than the trailer. While both are heavier, the X3 would be the safer choice in this regards. Plus it sits a tad higher so the trailer can be more level. Plus the back end won't sag as much from the tongue weight. All play a roll in the safety factor of towing.
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