interesting seeing a denso alternator on your truck
The rear doors may have had the lights if those panels are original. if they are swapped your truck may have not been made with them. doors lost them in 03-07 it seems
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DRL on these are nice in that they dont use your headlights to work, so they dont add hours to your bulbs/circuits
I use amber ones in mine, (legal in WI, not sure of everywhere) because I like the amber contrasted against the black truck.
There is actually very little proven benefit of DRL, GM just happened ot be a big pusher on them and for regulatory compliance in canada they had to be there , including the inability to turn them or the auto headlamps off by choice. sad for them.
So there IS an option if someone wants to. The same way you get 4hi mod with all 4 headlamps you can use the DRL to make an additional turn signal/park lamp that mimics the behavior (infact, you could probably manually wire it to the same effect , not sure if that year would freak or not.
It also could be used for something else if desired.
I do not recommend 4 hi mod because of the ability to not improve long distance safety in all conditions and actively harms vision in certain things up close like heavy snow or fog. If you made it switchable, that would work. like from in cab. 6 hi mod should be illegal period, it serves no purpose for seeing its actually just unsafe and shows me people like being assholes with what they hope is great visibility