The first thing that came to my mind after seeing that top image was one of these:
http://item.mobileweb.ebay.co.uk/vie...d=190964717250
Got to be easier to modify one of these than find something that is unobtainable!
From Wiki, Range Rover width: 70" - 1778mm
Volvo 240 width: 67.7" - 1720mm