This swing motion truck was manufactured by the Bettendorf Co. from 1924 to the early 1930s. Railroads that had some cabooses with this truck included ATSF, BN, CB&Q, C&O, Erie, EL, MILW, MKT, MP, NKP, N&W, Pere Marquette and Rock Island. These trucks could be seen under wood double sheathed, single sheathed, all steel, transfer, drovers and even extended vision cabooses.
Below is a link for the data sheet about this truck.
TMW-104 / TMW-204 Data Sheet