We have a 2006 Mondeo Zetec Estate, tdci - which is a fantastic tow car. It pulls our Swift with an MTPLM around 1350 (but now fitted with a motor mover, so a bit heavier) without any problems whatsoever. We've towed down through France on the A75, which goes up to 1121 metres at one point (at 3678 feet, higher than the top of Mount Snowdon) up some very long winding hills, and it just keeps going.
Best of all, the fuel consumption is good, both towing and solo.
We've had five company Mondeos, and when OH was made redundant we bought out own. All have been good towcars, perhaps the best was the previous company car, which was a higher spec, though older than our current one, and with six gears (we now have only five).