None. The WWII Bantam T3 and Willys MBT were originally shipped with 8-leaf spring packs to handle the specified 500 lb. payload. The spring pack was later upgraded to 10-leaves (used for M-100) as these trailers were often loaded with the maximum 750 lb. highway payload, and many WWII trailers were upgraded to 10-leaf springs through the years.
If yours are the original 60-year-old Bantam T3-C springs, with 9 thin leaves, some of the leaves are probably brittle. Removing a leaf is inviting spring failure. My advice would be to get replacement springs, bushings, etc. (unless you are doing a true restoration, in which case I would suggest a spring shop to duplicate the originals). Off the shelf aftermarket replacement springs (front springs for MB, GPW, M38, CJ-2, CJ-3, etc.) typically have 10 leaves and a military wrap (what I use), but if you look around you might find some with 8 leaves and no military wrap, which would be the closest you are likely to find to a replacement for a civilian Bantam trailer.