Bob I'm not sure if you still check this post but or for that matter have already built your trellis but a adjustable hop trellis will work, I picked this trick up from a online hop growing forum ( I wish I could remember which one). This technique applies to both in ground and potted hops. First ou do need a smallish trellis 5 foot or so then second tie off a 20' + stranded piece of sisel twine or hemp rope etc just make sure it's strong to the trellis and loop the other side over something 20' high ie. a tree limb or a piece of lumber through a eye hook etc, be creative. Next take the other end of the twine and tie it to a looped ground stake leave yourself ample length on this side.Done. As the bine grows you can adjust the height of the growth by releasing some slack on the ground loop side to lower the height on the trellis side. I have used this technique very succesfully as I have very limited height where I live ( townhouse). I will post a picture later today to show this in pictures.
Funky Onion Brewing est.2010
Primary-Turbid mashed Lambic
Secondary-Burley whiner American barleywine
Primary-A dark German lager or a Hoppy Munich Helles