I had 18 ga stainless steel brake metal pieces fabricated and ordered "extra wide accordion gasket" to bridge between the two parts
The RV box wall is 2" thick and the cab wall is 1-1/4" The upturn "hemmed" leg is the lip for the gasket. The gasket is designed to go between a pickup window and camper shell, compressed, 2" fully expanded 7". I set up my gap at 3".
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