I'm not aware of any 275/65R18s that will fit in the spare wheel well, it prevents the boot floor from closing properly, but perhaps aired down it may work. I went with a highway tyre 255/70R18 as my spare, haven't needed to use it.
Murchison sell a bracket to install the ARB compressor under the bonnet.
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MY14 GC LTD CRD-ORA2/QL|Mopar 18" Night Fever Rims&RockRails|Chief Hooks&Sump Plate|STMaxx 275/65R18
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