I'm looking to not fill up the CT SYS as fast, it would be mostly used around the shop. I have a DD hooked up to a CT-36 but was wondering if anyone has tried it or uses this combination. For portability I think they should stack together and be able to ride on a cart with other Systainers (obviously the DD would have to be on top.) just doing some thinking if the CT SYS is a worthy investment. Thanks