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Yes the vulnerable spots ! That is what started me on replacing all the lines with stainless steel PTFE hoses. I replaced the one that goes under the radiator first. Then since that went so will I replaced the one that went to the filters then it just kept going until they all where replaced ...

Or you could have went with the stainless steel PTFE hose and never had to worry about the hose again period. I found the main problem with copper tube is it work hardens due to vibration. I don't know about your truck but mine likes to vibrate. That's one of the reasons the military put hose...

By using this particle type of shut-off valve I was able to keep the hose tight to the firewall and I didn't have to buy two more brass 90 degree fittings. Plus it has a "nylon" insert and the valve is made of "brass" so no rust issues.

Here's some of my aux passenger side heater. The other one is the stock heater.

In your neck of the woods I would go with a "dual" cab heater system. That's what I did.

:ditto:

You could do what "Bonedoc" did but if your tight on cash you can use DOT Poly air line.