Not sure where in OK you are located, but you should check out the website of Rolling Retreats
www.rollingretreats.com in Elk City. Talk to Alisha or Slade about your needs, they might have the exact on in stock, coming in, or in used inventory. They are excellent to work with and if you were to order new, you won't leave with anything not to your satisfaction.
A used unit can be a great starter, if you find one near what you want in options. Remember, the DRVs are very heavy trailers--a 39' should have a 350/3500/450 dually tow truck minimum.
Joe