I have the possibility of a good deal on a LWB Crafter but it has no factory aircon in the cab. Because I will be doing most of my travelling in southern Europe I will need one for sure. Therefore is it possible to get a retrofit air con put in or if not would I be able to uprate the alternator to put in an after market electric air con system which I have seen are available but draw about 45A ! Any advise on this would be very welcome.