Try Hawk Engineering in southern MO http://www.hawkengineering.com
I also play in the dirt as does Jason Hawk of Hawk engineering. His specialty is used trucks with garage and drop deck garages.
He built our truck and we couldn't be much happier with the build quality and the way he stands behind what he built. We have had a few very minor issues and he has always been right there and its never an issue.
Let me know if you have any specific questions about our coach or the build process and I will be happy to share it with you. Ours is the center coach on the home page and it is shown elsewhere on the website as the Radcliff coach. I made many trips to inspect the truck during the build and have tons of pictures on the whole process.