Cab overs real purpose was to meet length laws. Every state had different length laws. And trucks got shorter to gain more cubes and stay within length laws. FHWA laws http://ops.fhwa.dot.gov/freight/sw/index.htm have now made cabovers almost obsolete except for city deliveries. Cab overs are still pretty much the standard in Europe because of all the tight places. I drove cabovers for over 30 years and they are not comfortable. But the tilt cabs were easy to work on.