I rented an ez-trencher with a bed shaping cutter on saturday for half day. Did i use it incorrectly? I tried poulling it backward but couldn't keep it as straight as moving forward. But when moving forward it fills the groove with dirt! AND!... the wheel follows the blade and packs it down. Here's a couple pics of the groove before and after i had to shovel it clean. It didn't really leave as clean a line as i'd hoped for. And a pic half of the dirt i hauled away. And one more of the distance.