Not a veteran at this due to the fact that we only got our van (Bailey Ranger 550/6) last Friday, but, I do have a Ford Galaxy 2.3 Zetec Automatic.
Towed for the first time last weekend and it was great on the flat, downhill etc, I did not know the van was on there. But on an uphill section, admittedly quite a steady uphill climb on the M25, I was struggling to maintain 40mph and my temperature gauge was climbing too (went up to about 75% where normally it runs at 50%).
The Kerb weight on my Galaxy is approx 1750kgs, the max towing weight is just over 1300kgs and the Bailey is under this figure, so all dealers etc. say it will all be fine. I am not so sure, but off again tomorrow for some more testing ;o)
But I am seriously contemplating a 4x4, really impressed with the Kia Sorrento, went to the motorshow yesterday and went on the advetureland setup that they have. The Sorrento made it all seem very easy.