How do restorationist Christian churches cooperate with mainstream Christian churches?

It's not hard to see how mainstream and nondenominational Christian churches cooperate with each other: it's common for them come together in community, charities, and many points of doctrine. This is refreshing, because there are many resources and discussions about the *differences* within Christianity. Some Christian churches even have classes about other ones. How do restorationist Christian churches, which typically fall outside the notion of *mainstream* for their notably different/augmented beliefs, cooperate and coincide with other Christian faiths? What are their shared values? In your answer, feel free to comment on lifestyle, culture, community involvement, service, morality, doctrine, charities, humanitarian efforts, missionary work, etc. You may mention specific restorationist churches using reliable citations (and official sources if possible).