I LOVED the Knight Rider 4-wide version of KITT! I managed to almost reproduce it on LDCad, but the back of the car puzzles me. I noticed some of the pieces are upside down and shifted half a stud to the back to create the rear bumper effect, but I can't figure out how those pieces connect to the rest of the car... I tried with 2 brackets 1x2 - 1x2 (99781) but something is not working right. I will definitely make a KARR version too if I figure out how to complete KITT's build!
EDIT: since nobody posted their 4-stud wide models, here's a couple of mine. They're very simplistic since I don't have much knowledge of newer pieces.
There were many jeep sets, but I don't recall ever seeing a pickup set, so I made one:
There was a SINGLE Bus that I know of included with set 379 Bus Station from 1979, which in my opinion is UGLY as hell. So I took inspiration from local buses...
And came up with this MOC, which is a little thin and tall, I know, but it works for me and it's a 4 seater + driver.