A 10' tent trailer is very difficult to keep "organized" with three people in it, even if one is a child. Don't worry, it gets worse as they get older!!!
Seriously, when we had a tent trailer, and then the pop-up, we policed dirty laundry out every day, stuffing it in net-style duffle bag(s), and keeping them where we weren't. If we were in camp, they were in the car, and if we were going site-seeing or into town, we'd move the bags into the trailer until we returned. Similarly, we used big Rubbermaid storage bins for non-coolered foods, moving them back and forth as well.
This constant shuffling of "stuff" is one of the reasons that we went to a bigger pop-up (the two kids slept in their tent and we used the opposite end bunk for storage) and eventually to a hardside.