Freight Car Trucks compatability

MTH sells some complete trucks separate, Can't say how the bolster height will stack up on your cars though.

My LHS (Local Hobby Shop) has the 3 rail Bettendorf and 3 rail Roller bearing freight trucks in stock for $15.95 a pair.

Bettendorf goes on older style cars, Roller bearing on more modern versions.

Not being real particular I don't know exactly which cars get which trucks.

I have noted some complaints about one of the other car having the wrong truck over recent years, you can search the board for that if you want.

You might want to consider the Atlas 3-rail trucks. Although they use the "thumbtack" uncoupler, they couple reliably, roll pretty well, and have several mounting options for various manufacturers' rolling stock. The roller bearing trucks have spinning caps.

if you don't like them for their operational characteristics rather than a cosmetic issue, plastic trucks are usually not the problem themselves, it is the lack of car weight.  i have quite a few Weaver PS-1 boxcars and they all have 2-3 large fender washers fixed over each truck.  after that fix, operation immediately went from occasional derailments to a smooth running train.

I recently swapped out the plastic trucks on my Weaver cars with Atlas O-3 rail trucks that I purchased from GE Hogger in the For Sale forum.  The process did require some minor modifications. I had file down the posts on the Weaver car where the coupler is screwed into the car to get the car to the right height.  Without doing this, the couplers would have worked, but cosmetically the car would sit too high.