Has anyone ever used those big W launch ramps?

DOWNHILLPHILL

Likes Dirt
How did they hold up for a bike? I mean of coarse a proper metal ramp would be better but my friends and I arn't that serious about it.
What we are doing is putting a ramp on top of this hill so you jump out and land down on the side of the hill, were on hardtail mtb's and we would be hitting it at like 15 - 20 kph.

Thanks.
 
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