But I ran across a story that the Recreation Vehicle Industry Assocation board of directors "will pursue federal legislation allowing fifth-wheel trailers to exceed the current 400-square-foot-limit" (and trailers to exceed their present 320 square foot limit). At 400 square feet, an eight-foot-wide trailer would have to be 50 feet long. And they want to go bigger! I don't know if the 400-square-foot limit takes slides into consideration. Why would the feds care how many square feet a trailer with its slides extended has? Well, maybe they do care and this is really about just making trailers more spacious. What do you think? Are present fifth wheel trailers big enough? Please leave a comment.