Good choice if you are looking to make the car float and use it as a boat. The back end will let go with any amount of water on the raod as the load on the tyre 'footprint' will be so low. Rethink to 6-8 inches max.
Good - Fast - Cheap: Pick any two.
E23 735i; E30 318i; E32 735iL (X 2 - 1 White and 1 Light Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i