It sounds like a parking light wire is not connected. look for wire or check the connection, I don't think that both light bulbs would have the lower wattage wire in the bulbs themselves would be burned out.
SOURCE: 99 Chevy Tahoe... Rear turn signals, brake lights, and hazards
I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!
SOURCE: No tail lights
Try checking the headlight switch it may have broken contacts in it. Easy fix go to a salvage yard find same make and model truck, swap headlight switches.
SOURCE: 2006 Chevy Trailblazer Tail Lights
There was a recall on this, take to the dealer and they will replace the whole socket on this.
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