Our 2004 Designer has the alumninum trim butted up against the pin box, with no decorative trim, but no gaps, either. Never really gave it a thought. But every spring we have to evict a robin with her nest from the pin box itself, despite putting a piece of masonite over the opening. Somehow, she gets in there no matter what barrier I put up.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.