I've got a 2012 XC90 which has the 200hp D5 diesel. The earlier ones have the 163bhp version which is still adequate to tow a large 'van. One thing to check (and this might seem obvious) is that it actually has 4 wheel drive. A problem which seems to occur is failure of the AWD system which leaves you with only front wheel drive. A useful source of information is the Volvo owners forum - http://www.volvoforums.org.uk/forumdisplay.php?f=37