ERF 'European' (1975)

ERF-Continental:
I saw earlier input on differences (chassis-versus-cab-types) but didn’t notice
real existence of e.g. 6MV or 6MW…so why the jump to 7MV (doesn’t exist
neither according to this thread) …

As far as i can make out, W was set back axle, V was set forward axle, so:
3MV and 3MW were narrow, single-screen cabs(?). The 3MW would be the same as a Seddon or Guy, but with the ERF front panel.
4MV and 5MW were wide, split-screen cabs.
7MW was the ERF-developed tilting version with the “Scania” front panel. As far as I know, there was no 7MV.
You would have thought that the number would denote the length of the cab, so 5MV would be a forward-axle sleeper, like the Leicester Heavy Haulage example, but that is a 4MV and I cannot find any 5MV, 4MW or 6 anything on the internet. Someone post a definitive answer, because it’s driving me nuts.