So we have had two enclosed Haulmark trailers both 28' and have served their purpose. Plywood floors are a ***** to maintain. If they get wet and then you drive on them especially if you have sharp 60 degree carbides they are trashed, you really dig. I needed a trailer for dual purpose, work and play. and at the West yellowstone Snow Expo they had a trailer I had never seen before. After finding out all the details, I now have a three place 20' Xtreme Sport Mirage trailer on order. They have an awesome 72" wide front drop down ramp which is amazing for getting sleds out the front. Compared to other trailer brands Mirage is a step above the rest. We loved our Haulmarks but they just dont compare. Interstate trailers serve the purpose as well but are just cheap trailers. Get a hold of a mirage trailer and youll never look back....I just realized that after all that soap box I didnt even direct my post towards your title. The other major reason that Mirage trailers are ten thousand times better than other trailer is because they have invented this type of floor called POLYBEAD. It is bullet proof, cant destroy it with carbides, way stronger, less slick, its amazing. So get yourself some polybead floor whether you have to call Mirage and tell them what your doing I dont know if they sell the sheets separately but you can probably find a dealer that can answer that question. Mirage Polybead whooohoooooo