I defer to your experience.
I don't think we're supposed to have fun here.
Here's a book to read: "How to develop a sense of humor". Sheesh.
I trust your post.
When you say tractors, do you mean 18 wheelers ??
The Cummins B series engines used in Dodge trucks since 1989 do not have glow plugs. For cold start (below 55 F) a heating grid in the intake manifold heats the induction air.
You are talking about Dodge trucks.
I am aware of many makes of big diesels.
This is an example of ignition without flame or spark as mentioned earlier in the tread.