Well the car is up and running and Lars is 100% correct, it rides like s*&^%! The rear sags and I get bounced like Iam in my brother-in law's clownmobile pick-up truck.
I've been looking into the airbag idea but that is a project and $$.
I contacted Strutmasters at strutmasters.com and they don't list a solution for Mercedes on their website but claim to know the TD rear suspension well and have a coilover shock conversion. I ordered it and will report when it arrives!!