My first commercial mower was a Simplicity 42" (73?)
Before the Toro GroundMaster, that's what we used to use!
Simplicity 48" w/ 16hp Briggs cast-iron. Then we had "trails": 2 additional mower decks - each with their own recoil start 9hp cast-iron Briggs.
The early ones were gear drive, then later hydrostats made everything a whole lot nicer.
These (1975-1980) were heavy-duty, commercial-grade tractors and decks. ALL had full-length rollers and striped real, real nice.
With "trails" that 12' stripe was simply awesome.
In the early 80's, Simplicity became more popular with the homeowner market and did away with the full-length rollers.
I get a kick out of the Simplicty add, though. The "professionally" photographed ad looks about 60% as nice as Eric's "amateur" photos.
They oughta pay Eric to shoot with their tractors on his lawns.