G'Day 'Framer',
I have carried large metal objects in a 210 - one was a rear axle/diff for a truck at a remote location.
We spread the load with the use of a 5 ply flooring 'cutout'.
The cutouts left the tie down hooks free to use.
That also protected the carpet/upholstery etc.
We also used to fit plastic / canvas protectors to the upholstery etc when carrying some SLF...
Airmanship....and self preservation.