I previously had a VW Syncro to which I fitted an extra air conditioner compressor to give me high pressure air for tyres, air mattresses etc. This was run of a spare pulley on the engine as I did not have Power steering. I fitted a similar set-up on another Syncro by putting another pulley on the Power steering pump and running it from there. This worked like a dream, pumped up a 215SR15 tyre from 0 to 2 bar in about a minute.
I would like to fit similar setup on my disco. The only place to fit an extra pulley seems to be in front of the power steering pump as there is a bit of space between the PS pulley and the radiator. I still have to try and source/design a pulley to go here. The other problem is going to be to design a bracket to hold the extra compressor. I have not worked out mounting points on the engine yet.
Has anyone gone this route that can give us some advice.
Jimmy
PS. I don't like those vibrating things... and they are rather pricey