The database holds 5 RK Tractors models, spanning 15.4 to 42.2 PTO horsepower and three-point lift capacities from 679 to 2945 lb. 1 of them are sub-compact and 1 carry a verified factory loader record with its lift rating and measurement basis stated. Models listed include RK21H, RK24H, RK37H, RK37S, RK55H. Every specification is read from RK Tractors documentation, and each record shows the source link and the date it was last checked. Open any model to see which attachments in the database fit it and which fail, with the specification and margin behind each verdict.