Hi jsawyer,
Welcome to the Heartland Owners Forum and soon to the family of owners. We have a great bunch of people here with lots of information and all willing to share their knowledge if needed.
To change your signature, go to "settings" top right of page...then on left side scroll down to "settings" area and you will find "signature". There you can add or change it.
If it's doable,,,,go with the dually.
Jim M