From my experience with my 21' awning ; yes the support is necessary, as the roller tube of that length will sag under it's own weight.
The 14' slide awning on my coach doesn't have a center support , so I'd venture a guess that your support could be moved up to two feet off center and still be effective.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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