I have at least 5 flat racks sitting in the yard (Hay wagon), I farm but my issue with a hay wagon (flat rack) is, one. they are a pita to back up (I do it all the time), 2, used ones are usually well used and the king pins and tie rod ends are shot and most importantly three, too high up. I went with the boat trailer because the camper sits plenty low, in fact, on the trailer, it's around 12" off the ground and lower is always better when storing. I have a 12 foot high door on the storage barn so it goes in and out nicely, plus it was cheap (on Craig's List and I can use it (boat trailer) as a street legal utility trailer. Cannot do that with a flat rack...you can pull them down the road up to maybe 25 mph. After that the weave back and forth gets dangerous.