I made my roller out of 24" schedule 40 pipe 7 foot long. End bells are out of 3/4" plate and it is through shafted with 2 11/16" solid shafting. used 2 3/16" pillow block bearings on the ends. Empty weight is 900 lbs. With 175 gal of water it weighs 2200 lbs. After the snow melts I run the rake over the drive several times to bring the 3/4" crush rock back to the top. Compact the rock with the roll. Have had lots of uses for this thing, intend to run it over the pasture when we broadcast seed in the fall and roll over the top. It turned out nice, still have to paint this summer. I would recomend this project for anyone with a long drive, gravel surfaces, and general uses. My wife often asks why I need this or that tool and is soon finding herself using it. One design note though. You will find that a ring pull off the draw bar will not be able to turn to well without hitting the rear tires. I made my own version of the "Handy Hitch" with a 2" ball and mounts on the 3 point, almost twice the thickness of steel. I welded a 2" bulldog hitch insted of a ring on the tong of the roll. The ball hitch gets the tow bar away from the wheels and lets you make tight turns. You could tow this thing behind a SUV if you wanted easy enough to pull.
Chris