Ahh yes. We called it the Embree Sweep. Very efficient at 65-70 mph. Embree had a custom inward opening double door design on most of their Crowns. They liked it because it offered a shorter first step tread and they could add an extra step so the little old ladies on charters could step in easier without the taller standard Crown step height. I've attached some examples of the Embree Crowns with the Double doors.
Notice that 63 and 67 are the Rear Engine 6V-53 with Allison 6spd, full air-ride suspension, full underfloor luggage bays, super custom Embree designed units. Only seven of these were ever built, and they were all used exclusively by Embree Buses until they were retired. When I bought them all, except for 62, while 61 was scrapped before I could get it.
47 and 54 were also heavily customized Embree specials but had the standard mid-engine placement. Embree bought Crowns in flights of three at a time and they were all spec'd the same. Fleet numbers 53, 54, 55 were all full air-ride suspension with originally Hall-Scott 590 (2600 rpm) gas engines. Later they re-powered them to 6-71's and literally doubled the range of the buses since the 6-71 got at least 7mpg compared to the normal 3mpg for the gas engines.
47 was part of a flight with normal leaf spring suspension and originally had the, standard at the time, larger displacement Hall-Scott 1090 (2100rpm) engine, and it was also re-powered to the 6-71. Made it an awesome Crown, as were ALL the Embree fleet Crowns.
I was totally spoiled from the very beginning by starting my career with such an exceptional company, who, by the way, had a very, very close relationship with Crown for their own buses, as well as engineering innovations that Crown adopted for their own production under license. For instance, the Crown side mounted radiator setup was originally an Embree design that Crown adopted and licensed on all their buses. Embree had so many innovations and original designs it's hard to know where their stuff started and Crowns' own engineering took over. They were very tight that's for sure.