You say the longer side is about 52 studs, but how wide should the surface be?

@sondre99v The half-width liftarms could be quite long and could extend in different directions, providing ample opportunities for various connections - depending on the available space near the connection. If empty spaces can be secured at a certain radius, additional pieces can be used to hold the liftarms against the trailers. Or just having a long half-width liftarm and attaching the trailers via 1.5 length pins blocked by bar pieces could provide a connection with enough strength that does not even exceed the envelop of the trailer.

If I count correctly, there are 65 minifigures - Presumably most of them are generic ones, but properly identifying each one would be a task way too daunting to ask of internet volunteers.

Hi Heidi and welcome to Bricks.SE! Please take a look at the method described in Henrik's comment and let us know if you have any issues following it. You can also take the tour or check the help center pages to learn more about the site and community here. Play well!

@brydiedyer It's a nice theory, but even the question shows that sometimes the single piece step is the first step, when nothing is finished yet.

To save future would-be answerers some time, the instructions for 9337 are not included in this repository: github.com/TheProgrammer163/megabloks-instructions