And any high up attachment will require a rather long pole, as shown in golf bag setup, and how the trail a bike things are.
Agreed. I am wondering how to bend the pole properly to get the optimal angle on the trailer. The stroller had quite a bit of aluminum tubing I can repurpose. I want to be careful before I start cutting the tubing. I was thinking something like a tie rod end might have too much flexibility and allow the pole to pivot down too far. It looks like the Travoy might use some type of a rubber bushing. I've seen people use a section of hydraulic tubing as a hinge. I'd expect the tubing would need to be replaced as it ages.