The system needs documented limits that cover your cat and the way the components may be used together. Ask for the whole-system rating, individual platform or hammock limits and any conditions attached to those figures.
In a multi-cat home, consider whether two cats might occupy one shelf rather than assuming they will distribute themselves evenly. Do not invent a universal extra allowance or calculate a safe rating from the diameter of the pole. Loading claims depend on the design, its installation and the manufacturer's assessment. Check that the information refers to the exact kit and configuration you intend to buy. If a rating is unclear, request a written explanation before purchase. Even a suitable figure does not replace the need for adequate resting space, secure access and the correct wall or ceiling support.
For two cats, record each weight and their combined weight, then identify which accessories they might share. Present that real-use scenario to the supplier; it is clearer than asking whether the system is strong enough in general.
For product comparisons alongside this advice, see Feline Sovereign Spire and Modern Vine. The details below explain their sizes and uses.
Further reading: .
Feline Sovereign Spire
Modern Vine
SkyRoute wall climbing set