Give Rush Truck Service a call. Ford trucks on the far west side of OKC right on Interstate 40. 405-782-3510 A Flying J is right next door. This area of town is kind of the center of service/repair for cross country trucks on Interstate 40 between Amarillo and Fort Smith.
I have never used them but they are a pretty big outfit. http://www.rushtruckcenterokcity.com/
You don't say where you are currently located. Lots of service facilities on 40 in Amarillo and great folks in the panhandle that usually go out of their way to help people in my experience. Even if they are Texans;)
If you are west of Amarillo, you might pull into the Oasis RV Resort a few miles west of town and get some advice from them as to service. It is a pretty new, real nice place that has a lot of cross country business and I bet they could be helpful (806) 356-8408
It would be helpful if you posted your current location. Good luck.
PSW
2013 Phoenix Cruiser 2350
2014 Jeep Cherokee behind it
and a 2007 Roadtrek 210P for touring