One of BJ Upton's vehicles (the one I've seen him in) is a Mercedes Benz G500 SUV. I don't know what year his is, or if it's the Supercharged AMG variant, but it looks very much like this one:
Certainly a handsome looking car, but chances are he could probably drive around something a less obnoxious but even cooler then that.
Someone might suggest an Escalade instead, but according to the highway loss data institute, one out of every 100 Caddilac Escalades is stolen. That is an absolutely stunning number. The Escalade is a truly terrible vehicle, which makes it's 'desirability' all the more baffling. What compels someone to buy or steal a GMC Tahoe with a body kit?