Grand Cherokee isn't the best SUV for a large substage. It flexes more than I would like it to creating variations in the sound quality depending on frequency. It doesn't play terrible low due to the customer wanting tuning at 39 Hz but it is so loud on the higher freqs. The roof flexes about 2 inches. We haven't turned it up too much yet. Still tryin to find a better amp. This one is good but it's 2 ohm stable. We are probably getting a little over 2000 watts out of it now. Looking for a strong 3000 to upgrade to.