[sanddrag]

Generally, with this type of profile available from other manufacturers, the purpose of the T-nut is to drop it in anywhere on the profile, and then it rotates into place before tightening. This allows for easy additions of brackets to the middle section of the beam, even if the end sections already have brackets and hardware installed.

How would this be accomplished with normal hexagonal nuts? Would you pre-load the profile with any and all hex nuts you ever intend on using, and let them float free until you do? Or would you need to disassemble bracketry on one end to add something more to the middle?