I'm not 100% sure on that, to be honest. I know a V6 is used in trucks, as well, and is much more compact.
Yeah, they should or atleast a V6 which is more compact
I love cars with beefy engines.  I once had a Buick with a V8, back in college.  That thing was a beast. That sounds big! Did you know a V8 is called that because the 8 cylinders are arranged in a V shape? Do you know much about V8s? I know that it is 8 cylinders I think most trucks have at least a V8 engine, right?
The V6 is one of the most compact engine configurations, usually ranging from 2.0 L to 4.3 L displacement (however, much larger examples have been produced for use in trucks), shorter than the inline 4 and more compact than the V8 engine.