I would take these guys up on their offers of presentations then I'd visit each dealer location in addition, I'd do one trial PM service with each, they may offer this as a courtesy? Observe the tech at the service, look for safety, housekeeping, documentation, quality of work, and personality, a red flag for me is a disorganized and dirty truck which could be an indicator of attitude and quailty. I had a similar experience where I found myself shopping for a local dealer and finally narrowed it down to two. #1 was eliminated because they couldn't provide parts (limited parts in stock VMI not offered) and field service support as we required, #2 was chosen because they had very good parts support (parts in stock & VMI) and good field response times. The issue with #2 dealer was the quality of the tech, we required someone experienced and ready to go what we got was everything in between. After 6 tech's we finally choose one that was a good fit for our application. In closing, sales and product support sales can visit your location and present what they have but in reality it's the tech the front line guy you will see daily and the guy that's going to keep your operation running. For you dealer sales guys don't forget to include that in your presentation.