To break it down you'll want to focus on working with established areas like iron mike's at lost lake and copeland's settlement, where timing your trust building is pretty crucial. The camps won't level up randomly so pay attention to specific activities - bounties give good early progress, rescuing survivors builds trust quickly and trading items helps especially during slower periods. Each trust level maxes at 3 but you'll notice better rewards unlocking steadily as you climb

The really important part is watching which upgrades become available where since camps specialize differently. Copeland's place is perfect for those early bike upgrades which you definitely want to prioritize since engine and speed improvements make everything easier. Good to know that iron mike's tends to have better weapons once you hit those higher trust levels. You'll want to split your efforts between camps carefully timing your trust building to unlock what you need most while keeping an eye on mission rewards that boost multiple camps at once