Anyone have to replace rear brake cylinder, drum, shoes on 2011 Transit?

What is your question?

Vehicle is used for deliveries so it has 70k miles but I'm wondering if this is common. I have two of these vehicles - one for each store. Should I start saving to get the 2nd vehicle done or should I have it checked for the problem? Replaced major parts on left hand side and there was also work needed on the right, supposedly because we drove it to the dealership rather than towing. Also wondering how this could have been avoided. Is there anything I could have looked for and could drivers have caused this or prevented it?