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Not every Dobsonian is the same

 Both are dobsonian. Metal vs wood:


Both are 16" F/4.5,typ 13 kg

Left: Explore Scientific 30kg mirror box + 10 kg rocker = 40kg

Right: 18-20 kg mirror box + 10-12 kg (rocker + UTA) = 28 to 32 kg est. COG is higher

reference:

sumerian alkaid

Alan xmission DS4

JWST back plane is made from prepreg comprising carbon fiber provided by Toray Advanced Composites and cyanate ester resin from Hexcel (Stamford, Conn., U.S.). Support payload of more than 300% its own weight.  

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