You must move on. There are too many contractors out there looking for work. Yes, it is always better to go with a contractor who has worked on mobile homes before, but in your case you may consider another contractor to get your project moving.
We don't know anyone specifically in Santa Clarita, however, we are confident you can find a good person. A thought would be to call the local Realtor who handles a lot of mobile home sales. These people would be in touch with mobile home contractors.
If you find a good one, refer them to us and we can list them on this site - we are always looking for good quality people to refer business to.