Anchor brackets/tethers may be used to reinforce a vehicle's resin rear door without substantially increasing the mass of the resin rear door. Such anchor brackets hold an interior trim panel(s) in place, and keep the interior trim panel(s) connected to the door structure or portion(s) thereof. The interior trim panel(s) can act as a protective interior shield that eliminates any exposure of the interior cabin/passenger compartment from any outer (and/or interior) door panel cracks/gaps that may be created during an adverse event. Moreover, conventional interior trim panels may, during a collision, break apart, the broken pieces becoming potentially dangerous projectiles. By being attached to the door structure and/or door componentry, the chance that the interior trim panel (or portions thereof) becoming a projectile is negated or at least lessened.