Our first was a new '72 Vega and we could actually sleep in it. There were a number of other hatch cars that followed over the years and they were so much better for hauling while keeping style. The early Mazda6 4 and 5 doors looked the same excepting a rear wiper on the 5 door. Hatchbacks were always hard to find as few models and low production, but it would seem that 4 doors could all be built as 5 doors-so why not?