The Jeep picture is from 1951, when the SBB had some of them converted to rail speeders.
The ladder, wooden parts, and the tires all belong to a scaffold on wheels.
The scaffold was used for catenary inspection.
Yeah, all the passengers on the rail car proper are to provide enough weight for adhesion to move the trailer.
It's the tropical version of "how many bodies can you squeeze into a Mini" I'm guessing someplace like Samoa??
The axle loading on the trailer has to be starting to get up there heading towards rail-bending territory.
It looks like one of the truss-rods on the trailer is dragging in the sand already...
I hope they didn't have to travel too much further.
Unanderra in oz