Stability triangle applies to 3-point trucks, which is almost all of the most common lift trucks, such as 3-wheel and 4-wheel Counterbalance Trucks, even Reach Trucks and Order Pickers.
The Crown TSP is not a 3-point truck. It is a 4-point suspension system, therefore no stability triangle. This provides excellent stability, and greater capacity at higher elavations, unlike a Raymond Swing Reach which is a 3-point truck. The Crown requires a very level floor.
It is true that minimum and maximum battery weight is specified, however in most cases, a battery, or batteries perhaps for a TSP, which exceeds the max weight permitted won't fit in the box anyway. Max battery weight pretty much fills the battery box completely.
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