(The) Aronson Trolley Positioner...was specially designed by NASA to assemble and “Float on Built-In Air Pads” a 2 billion dollar spacecraft that was launched in late December 1999
Thee is a NASA spacecraft shown in images in that link, but I don't know if that's actually the spacecraft in question or not, so I'll defer to answers to look into that possibility.
Question: For which "2 billion dollar spacecraft" did NASA "specially design" an Aronson Trolley Positioner in 1999?
That's a lot of money for a spacecraft! The "120,000 lb. Aronson Trolley Positioner" was "built in 1995" and rated for
- Rotation Load Torque: 1,440,000 in-lb
- 2,880,000 in-lb
so at least we know it's bigger than a breadbox but smaller than a Space Shuttle.