Jimmi Booth, the toolmaker who cut the tool for the SP 52 flat car formerly offered by Red Caboose, has a technique useful for any of the 3-piece RC trucks.

Jimmi takes a hot soldering iron and over a flat service (such as glass) hold the assembled truck upside down and bearing equally at 4 points on the glass (This assures the correct geometry) and fuse the bolster end to each sideframe. The resultant fused truck accepts wheelsets well, and will track as good as other one-piece trucks. You might use "The Tool" from ReBox to provide better rolling properties.

On another note: There has been no takeover of Red Caboose by Intermountain. Bill, faced with changing economics, entered into an agreement with Intermountain in that all future assembled products would be built under the control of Intermountain. Marketing also is handled by Intermountain, as well. Bill has even gone to work for Intermountain, and after a year he was accepted into a Vice Presidency position (Of Sales). Kits are still the providence of Bill's Red Caboose. He wears both of his hats very well.
-Andy Carlson
Ojai CA