Trailer valet for towing 8X20 Bravo car hauler

We will be using it to store the car, kayaks, bikes and dog cages. All light stuff but bulky and we want it to be secured, that s why we went with the larger trailer. We are so new to this, thought this was the right way to go, I hope I am right. It looked like the smaller ones would not have as much room once the car was in