We went with 26ft trailer mid march.  As someone else mentioned it is good for rv only on the first four or so.  After that we wondered how we were going to turn around.  Spoke with blm guy and he said the gate was probably locked after the kiln this early in the year but we should be able to turn around there.  If looking to dry camp I would look elsewhere or drop trailer first and go in with truck to see if anything is available.