I mean... Lawrence of Arabia was a real person and his story was quite well known. Written into a biographical account in 1926.
It's not a far stretch to think Herbert was inspired by those stories as well as those of the desert rats and fighting forces in the Africa campaigns of WW2, Conrad's heart of darkness and well... Yeah everything in human history up to that point.
My job sees me putting a lot of really heavy objects on trailers, vehicles, boats and trains.
You must say "She ain't going nowhere" and tap the load with your hand or else she is going somewhere you don't want.
I swear by it. Every time I or one of my subordinates has forgotten the phrase its been a disaster. So we say it every time now and make sure the new guys do it to. Or else.