After reading many, many posts and build journals here, as well as Tony Latham and Steve Fredrick's books, I recently realized that my oldest son is graduating high school in 3 1/2 years, so if I am going to do this with them, I'd better get started! We found an old pop-up trailer that had been converted into a utility trailer with a soggy MDF deck and lots of rust. We removed the wood and are tackling the rust now.
We have already enjoyed mulling over design options and are settling on this use for our trailer, about 11 feet long and 76 inches wide, with a queen bed that makes into a u-shaped dinette to wait out bad weather and play games without the wind blowing the pieces away! Putting twin bunk beds up front. Not sure how quickly we will progress, but I'll try to post as things change!