I have a Utility Trailer (not an enclosed cargo trailer). I have though about using it to build a TD. However I still need a utility trailer from time to time. I was thinking that I would build a TD that I can put on the utility trailer. When I need to haul stuff with the trailer I can take the TD off. I have attached a few drawings of what I am thinking about. The trailer is raited for 900 KG so weight shouldn't be a problem. One drawback I see is the height of the side access door. I will have to build some steps for sure. Anyways take a look. Let me know what you think. I look forward to the feedback.