I have a new holland tc30, i am building a motocross track on my property which is all field with pretty hard pack clay as a majority. can some one tell me what will turn it over and loosen it up the best tiller or disk. What will work the fastest? I think a tiller will be slower but do a better job of loosening, but my concern is, is a tiller useless in hard clay. i need to turn the grass over and get something that is workable with my boxblade and loader. Does a disk harrow do much if the ground has not been plowed first, someone told me i would need a plow as well as a disk, i don't know? The disk is cheaper is my thing and if they will work i would rather save the money over a tiller. But do you think a tiller is more useful for other uses than a disk, any help is greatly appreciated thanks