I believe the reason why European trucks are usually cabovers has to do with overall length as much as gross train weight; you can only use bonneted units where the trailer is shorter than the maximum 40 feet, e.g. tippers/dump trucks, tankers. This also accounts for the smaller sleeper compartments.

lol

=

European trucks have a lower maximum weight for their trailers (I do not remember how much)
There was a project for raising that limit in Belgium but it was fortunately currently refused (our roads are already enough in bad state...)

Also don't American trucks often pull bigger loads than European trucks? I think the trailers they pull are longer. Also American trucks seem to have larger sleeping quarters.

Bonnet = Hood

Yes, american trucks have a bonnet coming out, European trucks are normally flat, and have a tilting cab.

Maybe bigger front ends?

Good pic's G-Mann
I used to take alot of photo's while wandering about London (many moons ago. with my old 110 camera.!) When you look hard, you do find some interesting things.
Note-goodwood pics:- you could always add a few here (doesn't have to be All of them!)
I missed the TV showing of the Festival this year (probably saw 'Goodwood' listed in the Radiotimes and though it was the horse-racing.! )
Eubank's truck looks 'flashy' (lot's of chrome & nice paintwork), but from MBSL65fan's comments, I wouldn't
say american trucks are bigger than european?

I don't see how a semi like a peterbilt would be used in Europe. it seems a lot bigger than other trucks in Europe.