I'm surprised he's been shafted. Especially with the amount of face time he's been getting in the comics.
The ONLY part of "Roadside" (the name for the parts when not linked) is shoulderpads. I'm making a large leap, since they are reminiscent of Zeta Prime, but the name "Roadside" makes me think Prowl since we've got things like Recon (Bumblebee), Saboteur (Breakdown), Rogue (Sideswipe), Assassin (Dead End), Ghost (Jazz), Slayer (Barricade), and Predator (Wheeljack) The names for the scouts tend to line up with their roles in-game or in-show (for Wheeljack)