That is the RGM street legal show car. It was painted with Jim Beam colors all this year. It looks since Jim Beam is not around and Monster is that RGM must have painted it black and put Monster's logo on it. I would assume Monster is touring the car until the NASCAR season starts or until RGM needs to tour it with a new Primary Sponsor.
Robby's souvenier trailer was out in the parking lot also. RGM trying to link with the Motocross crowd? Must be the Monster sponsorship being they sponsor the best in both off-road and here at motorcross.