How do you secure your loads?

[christoph]

Some of my Red Caboose flat cars are magnetic, others are not.  Obviously they used different type of metal weight sheets.
For the magnetic ones I use small round magnets glued into holes at the underside of the loads.  For non-magnetic cars I use that tacky glue or rubber cement.  Fixing loads with magnets is the easiest way.

[rogergperkins]

  Thanks for the recommendation for SCOTCH Brand Tape.
As a 3M retiree, my favorite for this is SCOTCH Brand Scrapbooking Tape Double-Sided Removable which is Acid-free.  There is also a version that is NOT labelled as Removable. Another words, one uses Post-It brand technology adhesive, the second one does not.
I have MTL and other loads secured to flat cars with the subject Removable tape.

IMHO the poster mounting adhesive would not be my first choice.
The Command adhesive strips are another option, but I have not used it in this application so do not personally know if would have any adverse effect on the paint on the load or car.