A couple four-wides and a five-wide-esque vehicle, each based off of a chassis part.
About this creation
Preface: I haven't named any of these yet, if you wish to suggest names then you can go ahead and do so.
Here's the first of 'em. Based around part 12622. Looks roughly the size of a five-wide to me but could be equivalent to a six-wide; I'm more experienced with 4-wides so I'm a bit out of my league as far as guessing this one's scale.
Both with and without a spoiler.
The car from the back. To be frank, I added only taillights because I liked the aesthetic look of that grill and couldn't hit headlights into it.
A semi-truck, based around part 30842, with a basic trailer, based around part 30836. This is my first ever 4-wide semi truck, and so I'm pretty proud of how it turned out. Even regardless of that, I feel it turned out the best and thus 'tis my favorite of the three.
Viewed from the back. The sculpted headlights may stick out but other than that, these fenders work perfectly for the mudguards.
From the front. The windshield technique takes inspirations from Chris Roach's original miniformer Optimus Prime.
The final one, based around part 2441/4x7 chassis. I think this one turned out the worst of the three.
Viewed from behind. I didn't add any studless part(s) over the read bumper because that would have made it too thick.