I use two 4 foot drag harrows chained together. The tines are heavy and about 4 inches long and will therefore mess up your base unless you cut them back to about 2 inches. I didn't bother, I just straped a 6 foot piece of ABS piping under the tines ( I used those plastic quick ties) both in the front and the back to raise it up so I only penatrates about two inches. This was supposed to be a temp solution until I cut the tines. That was five years ago, I never got around to cutting the tines as I works very well as is. I have to replace the quick ties every once in awhile when they break.
I had the harrows given to me, old ones seem to pop up everwhere, I used an old 6 foot iron pipe in front to chain them together and a chain from both ends centered by a big hook that attaches to the hitch on the tractor.
The ABS was scrap from a hardware store that had some cracked stuff lying around.
The chain and the plastic straps was the only cost.
Best of all, It does as good or a better job than a pro arena groom!
Fred