Hatch trim clearance

On my teardrop, I'm using RV roof edge molding along the roof/sidewall junction and on the hatch. Along the roof edge, I've installed it "tight" to the sidewall. How much horizontal clearance should I allow between the inside vertical portion of the RV roof edge molding and the galley sidewall of the teardrop?
(I was thinking to allow about an 1/8" clearance.)
Thanks for your responses.
(I was thinking to allow about an 1/8" clearance.)
Thanks for your responses.