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So many times people get unwanted opinions - so, don't mean to be rude, but I have to ask & comment: Do you want the bottom of the trench 18", or the top of the tile 18" deep? Either way is quite shallow, around here it does not pay to lay tile if it isn't 24" deep to top. It will be wrecked in short time if it's that shallow. Livestock & tractors will crush it, gophers will play with it, frost will heave it (I'm in Minnesota...) and any tillage will snag it. Now, you can do small pipe with the middle buster deal, might have to make several passes to work that deep, can even pull it right in with a little clevis or boot on the bottom of the buster. BUT, you didn't mention how big a pipe & how sturdy you are using. Soft squishy corrigated tile in hard soils probably won't pull... A plow will make a nice channel to 12", but hard to get much deeper than that, you'd need to plow away a few passes & go deeper - end up with more of a 'V' shape wider than your tractor to refill than a single trench. Kinda messy, but you could get 18" deep or a bit more if that's the bottom of the trench. This is just my opinion, tile laying is probably a little different here in Minnesota hard yellow clay than in other places so take it for what it's worth. :) --->Paul
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