Frontline's heavy wall rollers are available in three point hitch, or drawbar pull.
Heavy duty pillow block axle bearings are 1-7/16" in diameter. The roller axle is solid pipe and is continous through the length of the roller. The roller pipe wall is 1/4" thick.
There is a fill plug located on the end of the roller so that water may be added to increase the rolling weight. The fill plug is 1" in diameter.