OP, have you ever towed before? It can be a difficult task if you've never done it before, especially with a smaller truck/SUV. The X5 has a 6000lb tow capacity but think about the hitch also and reference the link below for info. Separately, Trailer from uhaul is usually 2200lbs and the car is 3400 lbs so you are right at the limit. The X5 is like 5300 lbs. towing over your vehicles weight at highway speeds can be a little challenging. You 100% need the trailer brakes hooked up. Think about safety before deciding it's not worth transportation costs.
Personally, if it were me and under maybe 800 miles I'd probably give it a whirl provided that my hitch held the weight. All the hitches I looked up for our trucks maxed out at 5000lbs though.
Link for info about actual max load:
https://www.doubledtrailers.com/dang...a-safe-weight/