Prototypical trucks for Caboose 17 are currently under development by Bethlehem Car Works.
Bethlehem Car Works Website

October 10, 2007
From John Greene at Bethlehem Car Works:
Patterns from parts supplied by Jack Burgess are being made. It will take about 3-4 more months to get truck assemblies that can be sold. The first set will be sent to Jack once they become available.

November 8, 2008
From Jack Burgess:
BCW hasn't forgotten about the trucks for caboose 17, however, the first manufacturer selected gave up on the project. The good news is that another manufacturer is already working on getting these trucks produced.