Our first TC was an old 1972 Sells that we fixed up for a trip to Alaska. It had a front window on the overhang. All was fine until we were on the way back coming down I-70 into Denver area. Suddenly there was a loud sound and a rush of hot air and wind coming into the cab of the truck through the "cat tunnel" we had between the camper and the cab. I pulled over and we found that the front window had shattered completely into hundreds of small square glass pieces.
We never did figure out what caused it (pressure change? Temp change from high altitude down into 100+ degree temps?)
We pulled into a Lowes and bought a roll of aluminum and self tapping screws and caulk to cover the opening for the rest of the trip.
We made sure our new TC did not have a front window.