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It's pretty clear that Cl Prime's truck mode is mostly freelanced, but I've noticed he bears a striking resemblence to a Peterbilt 372 cab over. Had I been familiar with these trucks, when I started my current kitbash, I probably would have gone that direction with it.

here's a page with several pictures of them. Might provide ideas for people looking to kitbash Prime.

I think you may be right in that regars Grey. the new Classics Prime is very similar to that model, and is just different enough to not require Hasbro needing licensing from Peterbuilt.