Hey the docapole doesn't look too bad. It looks like they even make a longer 30-foot docapole also:

https://www.amazon.com/DocaPole-Multi-Purpose-Telescoping-Changer-Cleaning/dp/B081K77J8B

which I am thinking of going with. The price looks attractive compared to what other manufacturers are charging. My suggestion would simply be to add guy wires in 2 or 3 locations along the length of the pole (3 guy wires coming down from each point). Any pole that long is going to flap around in high winds. No question about that!