Hi,
I read your message and looked at your website. Very cool. The Bailey Bridge road deck is 25.5 cm wide, so check your trucks to see if they would work with that wide of a bridge. I have not sold the stl files yet, but I can. It would be difficult to scale the bridge parts up in your 3d slicer, so please let me know if the 25.5 cm wide bridge works for you.
Movies of the bridge are here...

https://colorado4rctanks.wordpress.com