This T-Post/U-Post combo has served me well for many years. I'll take some actual closeup pics of the trellis later. Costs about $20 all-in.
1 x 6ft T-Post - Consider this an 'anchor post' that will stay in ground year-round
2 x 7ft U-Post - Use two short bolts to overlap/connect them through their pre-drilled holes. This ends up being 12ft or so
1. Prepare soil
2. Pound the T-Post into the ground w/ a
post driver or sledge hammer to at least 15-18" depth
3. Connect the two sections of the U-Post. Two nuts and a washer per bolt works great. Rig up whatever clip/carabiner/pulley you want and twine to the top of the trellis. Give yourself enough twine slack to adjust once the post is up.
4. Align the inner "U-Part" of the U-Post so it surrounds the T-Post. On the side of the T-Post that is flat, not the notched side.
5. Push the U-Post into the ground as far as possible. Make sure it is snug against the T-Post. If soil is loose you should reach it's anchor plate
6. Lash the U-Post to the T-Post with lots of bailing twine, galvanized cable, etc. Twine works fine for me.
7. After the growing season, cut the plant and remove the U-Post. It pulls up easily. The last pics show yours truly carrying the hops trellis and laying it across two saw horses for picking.
The only way a pulley/carabiner system works with this method is if the root crown is a few feet away from the vertical post. Any closer and the plant inevitably will wrap around the twine and post. My posts are right by the root crown, but I harvest/cut all at once.