Uprating the suspension won't change the hitch load limit, otherwise it would suffice just to observe axle limits and ignore the towball limit. For that matter, changing the suspension won't change the plated axle limit, MAM or maximum train weight either.
The type approved towing bracket will be designed to the limit, which could also have regard to the mechanical characteristics and location of the attachment points. The towbar and if applicable detachable hitch are probably placarded too as the "S value". The detachable ball if you have one may be rated higher as they are used with different towing brackets.
Don't forget the caravan hitch also has a limit - most Al-Ko chassis are 100kg IIRC but the on on my Eriba is only 75kg.
The C-Crosser, Peugeot 4007, Outlander will take 100kg on the towball too.
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