Chevy engine service on Class C

My Chevy Class C is smaller than yours. I take it to Chevy dealers for service, but only certain dealerships can handle it. Unbelievably, when I ask how wide or tall their service bay doors are, some of them do not know. Usually I end up at the commercial truck area. Once finally in there, they have always done good work including a check engine light issue while I was far from home last year.