Implement plan source?

Weld plates on each end to mount axle stubs and put a pipe plug in it to let water in and out of it for weight. Take some 3" channel iron and make a A frame to run up forwards for the drawbar hitch. I used some 1&1/2" bar stock and pillar block bearings for my axles.

For the 1st row of aerorater teeth turn sickle bar teeth sideways and weld a straight across the length of pipe line of teeth with the teeth 6" apart all the way across the drum. On the 2nd row measure up 6" then straight across, and space the teeth at 6" centers with the teeth alternating to be spaced 1/2 way between the 1st row spacing. If you keep alternating the spacing like that and go all the way around then when the drum makes a turn it will spike the ground about every 4 to 6" and 4 to 4.5" deep and won't pull any plugs at all out of your grass. You could make the teeth go deeper but this does a good job in bermuda, St Augustine, and bahaia grassed pastures.

This type aerorater will also pulverize some very hard clay dirt clods.

I pull mine like a trailer because it was simpler and I don't need out on any roadways. You should be able to pull a 5 or 6' aerorater like this anyways.