I need the poles to be raised about 9 or so inches off the ground (I use them as canter cavalletti and as placing rails for jumps), and had some GREAT cavalletti ends built by my dear, late father; he was quite the carpenter.
He built them as Xes out of wood with varying height options - one side had a plywood fill with a cut out for a pole to rest on, and he drilled a pole sized hole in the center so there were a total of 3 heights depending on how you set them on the ground and where you placed the pole. They were incredibly useful, and I had them for a LONG time at my last boarding barn, but they sat out for years and started to degrade (I left them there when I changed barns, had bred my mare and moved to a farm where her filly could grow up, and there was no need for them during the first few years of her life.)
My husband (though he did build me a great mounting block) is not quite a handy as my father was - and no WAY I could do anything like this even if I had the skills since my hand arthritis has gotten pretty bad.
The potty chairs are great since they are lightweight and can just be put in the corner when not in use. The “Bloc system” is also handy (though they tend to retain water!), but they are quite spendy. I actually heard about the Potties on COTH!