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im sure this can vary by dealear but usually the salesman sees the report and at a minimum knows your fico score and any stips so they can match you to a vehicle
Just to get an idea of what you're looking at and before dealer pullers your credit how about telling him/her your up to date FICO scores?
It's smart to get pre-approved by your CU before going into the delaer, and then you can negotiate on price alone. And once you have a deal you can always let them try to beat the rate from your CU.
I like Penfed, nobody has been able to beat them yet.