Fantastic job! If I didn't know any better, I'd say you been building these for quite some time. The colors are real good together and she is really clean. What you need for them outside shots is an asphalt shingle turned upside down with the tabs cut off to make it look like a road. Personally, I vote for the lowboy, but then again, I've built a few of those and am kinda partial to em. I think she'll look great pullin' anything.
The last Peterbilt Alaskan hauler I saw sell on Ebay went for around $120, I have one and have built one, they go together pretty good and are a nice lookin truck as a tridrive.
This is just my opinion. Can't tell you what about it is authentic, only that its a nice big truck!
It looks excellent! I don't know enough about these engines to know what liberties you took, so to me, it is perfect. I would sure hate to hide it in a truck, but then again, that's what makes the truck look so real. I am looking forward to seeing your version of a lowboy.
This is a beautiful trailer, love the beams and the wood decking, if I had to make a suggestion, it would be to add or paint light buckets around the tail lights to help them stand out a little better and maybe some marker lights on the sides, everything else is top notch.