Careful of seeing these codes as an absolute...meaning that there are 'packages'
that has individual code options embedded in them...
Like, K5L from this site
RPO Codes - Chevrolet Truck Tahoe says it is "Trailering Package, heavy-duty"
Does that have HD cooling system? Most likely...
Look up/search for: "GM RPO Code" and you will get many sites that list them
Some say *ALL* of them...but OEMs are constantly adding/changing options...so
they are only as good as they day they released their lists
There are other RPO codes that reference HD cooling too, so you might
have one of them...or not...as most half ton SUV's and Pickups are
sold to 'car' folks who do NOT tow. Guessing over 95% of the folks who
order half ton SUVs and Pickups do not tow
