The best use of trusted is probably betrayal. The second best use is keeping Survivor allies that heal themselves alive when the encounter deck does one damage or one horror to allies. But the best use hasn’t been mentioned yet in reviews, and that’s to reload Becky.
For a measly one resource, a card, zero actions and zero XP, you can make your disposable allies that much tougher. And then you kill them off, which if you’re building Tommy right you will. (Between Tetsuo, solemn vow, or even self-sacrifice, you should be cycling allies regularly.) And one damage and one horror means two more bullets in a gun that perpetually seems out of bullets.
Even better, it’s two more damage if you plan on the level two guard dog and space things out, turning the pupper into a 5/3 powerhouse. With this card, officer Muldoon can turn trust into a one-way street.