There are two types of trust.
In that their actions are predictable, I can plan accordingly. If I can predict that you will be a complete washout in something, and you are trust1worthy, then I will know not to include having you do that thing in my plans. I can rely on your strengths and not expectthings from your weak spots. This sort of reliability is necessary to trust2 relationships, but does not require trust2.
This is an almost impossible form of trust. However, it is achievable, and sustainable given sufficient communication between two people and a high enough ability to understand each other's true inner desires and motives.