I am just now realizing that arch bar trucks come in different size wheel bases, why? Is this for a logging operation vs a larger mainline railroad? Looking again at the arch bar trucks I got from athern, they seemed tiny initially, especially when next to the 3 rail caboose trucks from atlas. The athern measure out to 5’ center axle to center axle, is that the right size for Atsf caboose mentioned above and a NP 24’ wood caboose or should I be looking for a larger truck? When under the caboose they look tiny to me ( truck on the right) , but maybe that is my 3 rail roots influencing me? The plastic athern trucks have no bearings on them just plastic, besides the added drag, can one actually wear out one of the these trucks over the years? I appreciate the education from others on this.