Okay, this is a thread a lot of you won't be thrilled with, but maybe some history and some work-around can come from it. I just added an area to a zone. I didn't want to go through the hassle of renting a trencher for the little bit that I was doing, so I dug it with my tractor mounted backhoe. Now I am paying for that mistake with big trenches that aren't settling as quickly or completely as I would like. I am going to start working on the backyard soon, and thought I might try plowing in the pipe instead of trenching. I might be able to rent a plow, but I haven't seen them at any of the rental yards around -- even the commercial ones. On a tractor users forum I read, several guys have plowed pipe in with a sub-soiler, which is basically one big tooth on a three point hitch mount. One set-up chained the pipe to the sub-soiler and pulled the pipe through the ground. I think this is the way most dedicated plows work, right? Another had a big sweeping 2 inch conduit elbow pointed back from the ripper, and the pipe went down the conduit and laid into the trench. Have any of you seasoned guys used a set up like this before the days of dedicated plows? Is there an advantage to one approach over the other? I've got really rocky ground with a very heavy clay content. It seems like the laying in as you go would be kinder to the pipe than pulling it through the ground. I am planning on doing the back with poly laterals, rather than pulling PVC, unless someone here tries to change my mind. I have a 22 HP diesel garden tractor (JD 455) and a 35 HP utility tractor (JD 4410). If the GT will get it done, it is a lot more maneuverable. But the 4410 has some serious power, if that is what it takes.