Easiest Place To Tap Dome Light Wire (2nd Gen w/ link to 3rd Gen)

You could swap the overhead bulb for an LED type. And/or add some LED where you need them tied into the cab illumination circuit, switched by the overhead lamp control switch (parallel) or like the the visor illumination lamps circuit. (ON/OFF type)

Something like these:
https://www.vleds.com/pod-3-w-5500k.html

 

Just a thought, but you might want to try this dome light. I put it in mine and you could read War and Peace in there now. $12 for two. Plug and Play. 5 minute install.

$12 AUXITO 578 LED Bulb 211-2 212-2 Light Bulb 39 41 42MM Interior Lights 6500K White Super Bright 4014 SMD Festoon Error Free for Car Truck LED Dome Map Door License Plate Courtesy Lights Bulbs, 2 Pack

https://www.amazon.com/dp/B09W2G41N4?ref=ppx_yo2ov_dt_b_product_details

Picture attached of the interior in the dark:

 

I would agree with Caribe that swapping out the interior map lights with LED's will help alot. I believe Auxito has a kit for that too.
I swapped out all of mine a few years back with a different brand, and they all work fine, and are brighter than factory, other than I was not impressed with the dome light, hence my install of the Auxito ones.