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Standard load would say 225/45 ZR17 91V,W,Y, whilst extra load/reinforced would be 94V,W,Y.
"A tyre's maximum load is the most weight the tyre is designed to carry. Since a tyre's load carrying capacity is related to the tyre's size and how much inflation pressure is actually used, maximum loads are rated with the tyre inflated to an industry assigned inflation pressure.
Additionally, load ranges are used to separate tyres that share the same physical size, but differ in strength due to their internal construction. "Higher" load ranges are used to identify tyres that have a stronger internal construction, and therefore can hold more air pressure and carry more weight.
Each load range has a assigned air pressure identified in pounds per square inch (psi) at which the tyre's maximum load is rated."
You will most likely find that a fully laden laguna II will exceed the carrying capacity of a standard load tyre.