I was having about an eighth to a quarter of an inch gap on the trim piece on street side of overhang. Sent all of those pictures to Heartland and they said all was OK. So, I quit worrying about it and covered those joints with narrow strips of eternabond tape I cut off of a wide strip. Looks pretty good and seals the small gap when attached to the trutck. I also had an expansion joint vertically from the bedroom slide that was showing movement and covered that joint with eternabond tape also.