The Uni 18 is excellent. I can highly recommend it. I have used it with my TSA 120 on the Vixen GPD2. The Planet tripod is even stronger and more rigid but much heavier also.
I bought the Uni 18 from TS several years ago. It has been totally reliable and a pleasure to use. Their freight charges have gone up a lot in the last year or so.
https://www.teleskop-express.de/shop...---Mounts.html
It is also available from FLO with double clamps and longer legs.
https://www.firstlightoptics.com/tri...-heq5-eq6.html
The freight charges are better at FLO currently. I bought the Planet tripod from FLO last year.
You can also buy direct from Berlebach in Germany which may be the best option if you want to choose from the various colour and accessory options.
https://www.berlebach.de/en/?bereich=details&id=139
Andy