I have an ARB single compressor that comes mounted in a box and I run it as Andy suggests from my Traxide rear Anderson plug. I prefer this to the under bonnet mounted kits as it is more flexible, easier to get to in the back than under the bonnet, and you can transfer it between vehicles and even lend it to mates. Little trick, when you cut the alligator clips off to put the Anderson plug on, attach the Alligator clips to another Anderson plug and you have an instant adaptor so you can still use the clips on battery on a vehicle not equipped with an Anderson.
I have found the ARB unit to be long lasting and reliable and I reckon when I am coming off the beach is seem to pump my tyres up more quickly and be on my way faster than many of the others I see using the cheaper compressors, especially when it is hot.

