OMG... you mean these cars can go in SAND? Who knew?

My only travel will be to the house from dry land. And then vice versa. I am not looking for an extended expedition anywhere else. I also have all the right tools to air down, dig out, tow out, air up... No worries.

And yes... The X5 should be put through its paces on the sand!

If you still have run flats, airing down will give you almost no benefit. The stiffer side walls will not allow the tire to flatten out. Also I would guess that a non run flat 35 series tire will not deform mutch either.

If it is just to the house and road, you should be ok to follow the existing path.

On the X I am running the Conti DWS's.

I had run flats on the SRT8 that I took to the OBX last year and little issue with. I didn't air them down by the way. Didn't see any reason to considering what they are made to do.