I currently hold the records in NSPL's Truck/Suv 0-1800 and Truck/Suv 1801-3600 classes using 2 Sundown Audio NightShade v1 15"s.
150.3db using 1484watts of clamped power.
152.5db using 3050 watts of clamped power.
All equipment in the cargo area. It doesn't have to be but all equipment is also below the window line. All metering is done with the mic in the legal windshield position and the vehicle totally sealed. My best Truck/Suv 3601-up score is a 155.6 which would also be a new record but I haven't made it to a 3x event yet to get it certified.