Highly doubt they are made in the US. 32MM is puney. The benefit of the RT90C is actually its heavier weight and 40MM carbon legs.. Much more stable than lighter platform and you can even add a ballast to it to increase stability. The only ones that look to be made in the US are $900+ and look heavy.
Seriously. Just but a RT90C , an Anvil 30 and the adapter. Its $800 and you can always upgrade the tripod down the road. Its a proven combination and you won't see anyone saying anything bad about it.
Go with something proven otherwise enjoy everything that goes with being a test dummy.
Wait a minute. In another thread you were all "RRS or nothing" and shit about leading horses to water.
Where's the picture of your setup? You have both of these? Or none of these?