There are a number of shops in the Elkhart area. The only experience I have is with Master Tech there. Tim, the owner was our service person. The services performed are done well. Their shop rate is $110.00 per hour, except for electric, its $120.00.
28717 Holiday Pl, Elkhart, IN 46517
Phone:(574) 522-6224
They have 50 amp hook ups and water available. I was there three days last spring waiting on a part. Perhaps someone will suggest others.
Not too far from Niles, MI and the rest of SE MI.
Stan