>>They are only good for 2-railers, since the underframe gets in the way when trying to mount high rise trucks.
A Dremel (or hacksaw blade) can take care of that. I have put Weaver 3-rail trucks on two Westbrook kits in the last couple months. You can just cut the underframe a short distance in from the bolster and mount the Weaver trucks, using fender washers for spacers as needed.
The eBay suggestion is a good one. I would buy these but my spouse would serve papers on me if I get any more kits.
BRUCE