Personally I wouldn't want a pressure vessel on my vehicle ... too dangerous. Those things are potential bombs and here in RSA there's a whole chapter of regulations dedicated to them. Firstly there's the protection problem .... rock sliders are exposed and maybe not as vulnerable as front or back bumpers. A bump or damage could cause it to rupture, especially on a seam or weld. Then there's the integrity ... one would have to use thick wall steam pipe and that makes it heavy. Also any welding would have to be done by a coded welder. And then there's the volume problem, especially if the intention is to pump tyres, There simply isn't enough volume available in an accessory that doubles as a pressure vessel unless it's able to contain an extremely high pressure, making it even more lethal if it were to rupture.
I would be far happier to spend a fraction of the extra cost that would be required and buy a mini compressor that can be stowed away behind the seat.
However, to have an accessory that doubles as a tank to hold water is a great idea, particularly if you're into overlanding / camping. Here I would be more inclined to use the rock sliders for that purpose because the extra water weight would be centrally spread over front and back wheels and not drag the front or the back down as would be the case with bumpers being used for this purpose.
Always bear weight in mind when it comes to accessories, equipment and fixed modifications. It will affect your tare weight, fuel economy and even centre of gravity depending what it is and where it's placed (e.g. roof-rack). For me mods are not just about aesthetics but also practicality and the best options are the ones that can be easily added / removed as required, excluding bumpers and sliders of course.
Love to see how you finish it all off. Thanks for sharing. 
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Maar hoe cope jy met 'n voertuig wat nie eens op ' radar se skerm verskyn nie? 
Maar ek neem aan, daar waar jy met die lux ry, sal jy nie eers taxis kry nie :derisive:
