Windshield breakage in 2005 Class A due to chasis?

Not an RV, but years ago I had a car that I could crack the windshield on demand. It was a 1980 Chevy Monza that we installed a 400 CI V8 and 4 speed manual trans in. Later, we added sticky Drag Radials on the rear axle,and the first time I dumped the clutch, windshield cracked on top of passenger side. We replaced the windshield when it was due for inspection, and then a few weeks later we went back to the drag strip and it cracked on the first run in the same place. Too much chassis flex.