I pulled water line with my PT425 last spring. It was crazy easy.
I have a plow share that goes straight into the ground about a foot. I push it through the soil with the PT to make my slit. Then I went to the starting and ending points and dug a small pit hole at each location.
The bottom of the plow has a hole at the rear. I used some stout rope to tie the water pipe to the plow, put it back down in the starting hole and retraced my line. It is fairly easy to follow a line with the PT.
It went in like butter.
What I was surprised about was this...
The pipe followed a serpentine route with a bit S curve. After I was done, I was actually able to slide the water pipe back and forth by hand! There was very little resistance. I was kinda shocked that I could pull 100' of plastic pipe with not much effort at all. HOWEVER, if you drive over the trench, it will compress the dirt on the line and make it a bit tougher.
It is a very doable job with the PT. You may want to focus on the task of fastening the pipe to the shank of your slitting device. Cheap nylon rope breaks on tree roots and rocks. They make some Chinese handcuff looking wire mesh tubes specifically for this purpose when using vibratory plows.
I think you can do it. It is worth a try.