[Espeefan]

I think with the trailers, Tamiya sticks to the short ones because most normal, or casual RC guys, who buy these kits, don't have the room to store such a long trailer, nor room to drive it around in the house. Plus it's easier to package. Think how much longer a 53 foot trailer is. That's a whole lot more material to include in the kit, and a whole lot more packaging, times a couple thousand trailers in a production run. It was probably done to make the trucks easier to put on the shelf, more then anything.