I used to love those Lambo Trans Americas (Since my first GIJoe VAMP) not sure how practical they would be nowadays, but they do look cool!it reminds me of lamborghinis old suv.
http://www.dolcemag.com/wp-content/gallery/auto_lambo/lambo4.jpg
Edit: I thought they were called Trans Americas (thought I read about them back in the 80's), but apperantly they are called Cheetahs...