Assuming you're near a decent sized town, call a few of the local truck shops such as the service department at the Freightliner dealer. If they can't do it, they can probably recommend someone.
They may want the S/N and VIN of your MH to see what it takes.
I'm sure Redlands Truck and RV in Redlands, CA can do the work, but I find them a little bit on the expensive side for parts and they try to up sell you on things that don't really need to be done. The actual work and their mechanics knowledge was good. They also have their own RV park where you can spend the night for free coming and going.
Redlands Truck and RV web siteBill