Maybe its easier to understand other languages translated into english, if your own language is not english to.
I found the double tank for every of my trucks yet, excluded the Sterling 9500 for which i doesn't found any upgrade except paintings.
But its pretty hard to find. You've got to drive around and stop by the garages on your way. Maybe drive from LA to Orland and back i always find nearly everything at this garages.
But i think its true, that every truck has its own list of possible upgrades and this lists are divided between the garages.
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