Given the ROTF toy pretty much looks exactly like that, sans a side ladder and the roof gun, it would be stupid to not have it be Brawn.
I see this being Strongarm as she was just featured in RID and since she could expand the female demographic of these movies – especially how prevalent gender equality is right now. Also, considering the fact that female Transformers are pretty lackluster in these films.
I'm really tired of seeimg all GM and chevrolet vehicles in these movies. Mercedes and Lamborghini is a nice change and I like to keep it that way.
I'd rather Trailbreaker be a modified Toyota Rav-4, like this guy: https://transformersrollout.files.wordpress.com/2013/05/has22838r.jpg , Especially since My Wife owns one . I can dream, though. . .