I generally try to make equipment capable of dual roles, maybe 99% of time used as primary role but also capable to be used on the odd occassion for something else.
 
With this in mind, I have often thought that it wouldn't be a bad idea to build a roof rack out of two or three alloy loading ramps that would be used 99% of the time as a roof rack but in an emergency situation could be unbolted/dismantled and used as sand ladders or bridging planks.
Something like these ramps or maybe a bit lighter.
 
http://www.aulro.com/app/data/1202/medium/WP_000565.jpg
 
http://www.aulro.com/app/data/1202/medium/WP_000566.jpg
 
I'd be interested in your thoughts on this and/or if anyone has actually done it.
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