I find the system seems to be
1. If your in America they count all things added (e.g. Vixen Sphinx Deluxe carrying capacity 50 lbs ~ as if!), all else
2. Observe generally no more than 2/3 of that wieght rating if you want to do imaging (especially if you are thinking large / long OTAs in exposed conditions in high winds etc...)
3. Note the Japanese at the quality end are conservative on their limits - you can push it!
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