Are we talking drive-train/steering/suspension, or are we talking "house" systems? If you are in the Eugene area, Kaiser Brake and Alignment is very familiar with these vehicles. Schweitzer's Automotive is familiar with them as well.
For "house" systems you may have to find "RV Handyman" type businesses, as the major RV centers around here are not interested. Or other owners with experience and time. If you are not a member of the Cascader's club, I suggest reaching out to them as there is a great deal of knowledge there.