Towing cross country with a 4.4

[<deleted>]

Hello

I'm looking into purchasing a tow vehicle, either a BMW X5 or Nissan Armada. Obviously these are two very different classes of vehicles, but that's because I'm unsure if the X can handle a cross country tow - I'll be towing my s2000 from DC area to CA. Also, my S is a dedicated track car, so I will be towing to NorCal/SoCal tracks.

I think the X would be a lot more fun as a dual purpose car, but the tow capabilities of the Armada are unquestionable. My concerns with the X are the transmission and wheel base for towing that distance/duration, and through mountain roads with significant elevation changes and wind/sway.

Assuming a well maintained 2005 X5 4.4, would you hesitate to tow a roughly 4,000 lb payload (2,600 lb car and 1,500 lb trailer)?
Has anyone done this with their X? Any guidance/thoughts?

I don't have a trailer either - still looking

Thanks for your input.