I maybe wrong, but I would think the trim piece should mount on the front side of the heater lip edge your talking about in the 3rd picture. That way the water will come down the side of the trailer and across the edge of the trim piece and over the lip of the heater box lip. If it was mounted on the backside of that heater box lip your talking about in the 3rd picture then I would think the water would possibly leak behind the heater box and get into the wood area. Hope I explained this accurate enough to understand. Like I said I maybe wrong also, so don't take just my advice.
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PappaP
Former Owner of a 1999 Classic HiLo Model 29B
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