The biggest problems with spotting scope tripods are they are too light and vibrate in the wind; or blow over in intense winds.

I purchased a Professional Classic Combi 25 Tripod designed for use with heavier camcorders and TV cameras with a head sturdy enough not to vibrate.
It also has a central fourth leg that helps stabilize it even more.

To stabilize it so it cannot vibrate and to lower the center of gravity so the surface area of the spotting scope will not allow it to blow over: I tape nine 1/2 pound lead bars around the feet.

What tripod have others found to be more stable and wind proof for use with your spotting scopes.

At first it was wobbly until I discovered whoever assembled it never tightened up the screws in the swivel mechanism in the head.

I also use a 3/4 inch pipe clamp to anchor my spotting scope on the bench.

However shooting BPCR there is no bench to anchor to.
And for BPCR I use a larger spotting scope which has more surface area.

Few more, all for a spotter not a shooter.  I still like the Freelands bipods  better for self spotting while in position. I do have a tripod bottom for my freelands & use it when it’s windy or a heavier spotting scope.  Willing to give up some stability to maintain consistent position most of the time.

On the right Unertl as furnished with their 100 mm spotter. Rock solid takes two to carry it. Center with the 63 mm Unertl is vintage Tiltall, about equal in quality to a Gitzo less expensive. Gitzo is the Caddy of vintage tripods. 

Far left a super light Bodgen with a video fluid head, scope is a tiny Leupold 50 mm 25x compact. It’s the outfit I use the most. Almost resolves as good as the others lot easier to carry and use. The fluid head is a big advantage. Scope stays in my shooting bag tripod small enough to strap on the outside. 

I have too many spotters

Boats

i was shooting BPCR and needed a tripod for my scope. after shooting in BOISE with that wind i started looking for tripods. I found one made by MAJESTIC on evilbay and bought it. they are no longer made but can be found. super heavy duty with verticle and horizontal adjusts   fwiw   dave

If you look at Mattifotos or Bodgens on EBay get a catalog on line, many variations don’t want to bid on the wrong one. It’s the extra center braces that make them steady. Many have damaged or bent braces. Don’t buy bent. Heads are interchangeable and replaceable. 

Boats