i think the engine in a snub-nose is down low and slightly behind the driver, so near the back of the cab. sadly sometimes the cab actually will slam forward, the truck won't tip but rather the cab comes unlatched (like it does for working on the engine).
I had a relative killed that way I believe, he was a distant relative that i never met, so I can't really recall it that well.
This is what the underlying profile looks like: