Presumably the risk of a traffic ticket for covering the lights was less of a concern than the cost of replacing one of the lights broken by a stone thrown up from a car in front?
Funny that your trip from Dawson to Chicken was pretty much the same as ours. All I remember was the various tankslappers as we powered our way away from the ferry back towards Alaska. The number of times the trailer tried to overtake us was interesting shall we say. Didn't see a thing on our trip either and then drowned at the border crossing.
As soon as we made it into Chicken for a rest stop the weather cleared and we enjoyed a pint of Alaskan Amber in the sunshine before buying tacky souvenirs next door. It was a fun place but it was essentially just a Disney style roadhouse so I wouldn't worry that you missed anything! Did you do the pancake toss in Tok? :) Where is your next port of call??