I think you should just drive the X. I did a 6600 mile trip in my M3 and it was my best memory to date.

There should be trailers available with higher ratings, but I think you would be fine.

How much stuff do you have? Did you think about using the X to tow a uhaul trailer? A lot cheaper!

As far as shipping, I think you are likely going to be above $1000. The good companies are more expensive.

Good luck...

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver