On my second Nigel,brilliant tow cars,being in the car trade I bought both of mine though work.
First was an ex demo 97P plate TD with square lights but replaced it with a px 97R round lights TDI,bit higher bhp, which was just a year old with 14k on the clock.
The car has now done 122k and the only major problem was a new fuel pump at 109k.
I tow a 1650kg twin axel with no problems at all and it will hold speed up most hills.
I change the oil three times a year as they like fresh oil and keep an eye on the inner edges of the front tyres, both have worn here first.
We had several in with water in the passenger footwell which most dealers will replace the heater box for (dash out)most likely cause is a blocked drain at the bottom of the heater and is a 2 minute job.
enjoy your Mav
Brian