When I was a truck driver I drove a conventional for years. Went to work for a company that had cabovers. One night after driving for about 20 hours I pulled into a truckstop in Knoxville, parked and stepped out onto the fuel tank to get out. Uh, no fuel tank to step on in a cabover. I fell about 5 foot straight down on my left leg, sprained my knee and ankle. Took longer for my ankle to heal than my knee.