Blame Worktroll for this one, it's his late-night messaging that put this in my head.
I want to kitbash a couple Stronghold-variant Gun Trailers, and it occurred to me that an extremely easy route would be to simply start with a railroad-scale semi trailer, and just use styrene and other bits to add armor plating, weapons, and other greebles. The question is, how big are these things, what scale should I go for? I know Z-scale stuff is pretty close to Battletech stuff, but given that we're talking about a semi-mobile bunker capable of comfortably holding thirty men(plus the bunker's crew), I think it reasonable to go bigger than a real-world trailer.
So...does anyone know how big semi trailer models get in various railroad scales?