Pappy, the tillering tree is portable. Tim made it with some real craftsmanship. The top crosspiece slots down into the main vertical piece with a dovetail joint, which you can simply lift out when you disassemble it. The vertical piece fits into the base with a taper. You can knock it out with a good blow. The base can be secured to the ground with some pieces of re-bar. I will bring it next May to your place and you might want to take some measurements.
Dan