My first trailer was a 12' and 2nd was a 14'. I am looking to skip the 16' and go to the 18' and when i thought i had it all figured out i am wondering if i should just go to the 20'. How long is to long to haul a open trailer? What are the pro's and con's? Is there any benifits to a 20' that you don't have with an 18' besides 2 more feet?