Right from the start, arched vintage trailer  awnings are made differently from traditional flat trailer awnings.
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 Arched Vintage Trailer Awnings have pockets formed in the facings that surround the underside of the awning. The shock poles cross and seat into the corner pockets. dfoster@bellsouth.net
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Arched vintage camper awnings have a tie strap centered on the underside, to keep the shock poles from sliding out of position.
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Tie Strap is centered on the underside of an arched vintage trailer awning, to keep the shock poles from slipping out of position. dfoster@bellsouth.net
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In the front corners of an arched vintage trailer awning, the pockets are hidden in the facings, so when using the awning without the shock poles the differences aren't noticeable.
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The shock pole pockets are hidden in the facings on the underside of an arched vintage trailer awning. dfoster@bellsouth.net
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Image of a shock pole pocket, disguised in the facing on the underside of an arched vintage trailer awning. dfoster@bellsouth.net
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Measuring the shock poles, for each individual arched vintage trailer awning, is always a challenge. 
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The shock poles need to be just the right length to arch the awning upward providing extra height underneath and incline for rain run off. dfoster@bellsouth.net
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An arched vintage trailer awning, is suitable for the straight / level section of a c-channel  awning rail. The largest arched awnings that I make are the 8' x 8'size.