Here's how I converted our trailer into a cargo hauler worthy of a long trip.
Step 1: Teardown
Start by removing all of the nylon canvas bits that you can. Everything on our trailer was held on with nylon webbing, plastic cinches, and plastic buckles. There are also three metal supports which thread through loops on the canvas sides and back which must be removed.
Ours was designed to fold down so it would fit in the trunk of the car. I think we did this once. Anyway, after removing the roof, there are two large knobs which hold the side supports to the rear support (second photo). Once these are removed, the bolts at the front (photo three) and the back (photo four) should be removed. Once the supports are disconnected from the main frame, the remaining canvas should fall off. If it doesn't, go back and look for velcro loops or straps which you missed.