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Dash lights and tail lights are commonly on the same circuit. When your dash lights go out, you know you don't have any tail lights. Pull out the owner's manual and figure out which fuse (or fuses) are for the tail lights.
So are the fuses getting power, they should be labeled. like tail or ctsy, or inst? The dash lights are usually 5 amps. You will need to get a wiring diagram to ck it out. but you may need to start by looking at the headlamp switch. I cant believe any GM dealer could not help you. Forget anyone from a auto parts store being any help. I can ck tomorrow when at work for a diagram.
If the driver's side tail light is working, it's not a fuse. Use a test light to check for power at the bulb holder. One terminal will be for tail light, the other for brake/turn light. If the is constant power for tail light, replace bulb. If no power, trace wiring from bulb holder to driver's side junction. Probable broken wire between the two tail lights.