Seeing this set rekindled my interest in Technic. I always loved Mack trucks as a kid (they were all Macks to me for a while no matter who manufactured them) and of course Lego was my favorite toy. To have them come together in this set is great.
I was quite disappointed by the lack of tires in this set, particularly when Lego likes to say they produce more tires each year than any other company..Is no one at Lego familiar with the term 18-wheeler? I replaced those wide tires using these wheels from the Model Team Whirl and Wheel Super Truck. Unfortunately they are slightly smaller (by 0.4mm according to bricklink) than the original wheels causing the back mud flaps to drag. It also looks to have too much of a gap between rear axles with these.
I did not want to use stickers on the sleeper compartment panels yet as I may rebuild the sides with regular Lego bricks to have an actual window. For this reason I built the doors entirely out of dark bluish grey pieces to completely remove the black stripe on the side, but kept the top of the hood and cab black. I filled the small window hole in the passenger door with a clear 1x1 brick and 2 plates. Glass-less windows is one aesthetic of Technic I dislike. It's passable due to the large size and varying shapes used in models, but in this case it just looked like a hole as opposed to a window frame.
The trailer is also severely lacking for a truck of this size but I understand the Mack was the focus of the set, I want to build a larger trailer or two. I'd very much like a standard box trailer but that would take a lot of panels. Can't afford to get enough Technic panels for that at this time, but may have enough dark blueish grey 1x6x5 bricks in a random box of parts I got from TRU. Foremost, I'm planning to build a low-boy trailer with a detachable gooseneck or flip-toe ramps, possibly triple axle. Hopefully I have enough yellow Technic bricks from #8855 Prop Plane for this.
What other licensed Technic sets are the right scale to act as cargo? The Claas Xerion is quite large, but that might be accurate considering the size of the real thing, though I've only found one good photo of it on a truck trailer for comparison. I also thought the Volvo EW160E might be in scale, but may not necessitate a trailer that large on it's own. Unlicensed suggestions (maybe the upcoming Rough Terrain Crane?) are also welcome.