I would give David Force a call at the Amish Cooling Unit Warehouse in Memphis,Tn , tell him what you want to do and where you are located. He might know of someone in the OK or northerly Tx area that could do the job. You could also order from him on the website and have the unit shipped directly to whomever will do the installation. We had the Amish install done about (2) months ago on our Dometic model NDR1062 and had it shipped directly to Cummins-Onan in Kansas City as they have done other installs. Ours took about 3 1/2hrs but the 1200 series NoCold might run 1-2 hrs longer. You will find that Mr Force is very knowledgeable and helpful in determining what you will need.
1. Make sure that you get an air baffle for your unit as it is very important in assuring the upward air flow in properly directed towards the cooling units condenser. They are about $17.50.
2. You might have (2) approximately 4 inch cooling fans which are controlled by a thermal disc mounted on top of the condenser. I would seriously consider replacing these with (2) new ones from Best Buy, Radio Shack, etc as their prices are noticeably cheaper. I would also recommend controlling the fans with an manual on/off toggle switch mounted inside a cabinet maybe next to the fridge. The thermal disc do have a tendency to go out and would require pulling the fridge to replace. One switch for each fan.
3. Make sure that the lp burner for the fridge is clean and in good shape, if not replace.
4. Make sure the electrical element for the fridge is good also.
RV Cooling Unit Warehouse