For those of us that like to make our own, PVC pipes and fittings make building a laundry rack very easy. You can glue it all together permanently or glue only where absolutely necessary and leave the rest loose to break it down and store it. You can make it any size you like. In my travels, I have seen many different designs and studied them. Here are a few I saw:
If you have a hankering to make one for yourself, here are some specific plans I found on how to make a PVC ladder rack. Click here.