2015 Freightliner Cascaida Kingpin question

Can't help you on that one

 

Lots on google. I searched “truck spring shop”.
I was on holidays and broke a spring on my camper trailer axle. RV dealer wanted $115, I got one at a spring shop for $39.

 

The axle you described sounds similar to the fleet 2015 prostars I maintained. If the pin is part of the axle and is not loose or worn you can get king pin service kits. The spindles are 2 piece, upper and lower. Drive the old bushings out and the new in. You'll need a adjustable reamer to size the new bushings.
I paid 70 dollars for the reamer at Grainger.

 

If it's genuine Hendrickson, it needs reamed.

 

The international dealer told my boss the same thing he told you. The kingpins can't be replaced. I don't know how the pins are set in the axle. If it were me and my truck and it had a loose or worn I would replace the axle. It sounds like a money grab but on the other hand I haven't seen a loose or worn pin.

 

I never worked on the Airtek, but have done countless kingpins in Hendrickson steerable lift axles and I replace the "non-replacable" kingpin every time.