hi stilton1,
welcome to the forum, yes I presently tow with a Meriva but mine is the 1.7cdti, it's a great little tow car for the lighter van, mines a 1058kg 380bailey ranger that is a 73% match, there are plenty of vans out there within this weight range, but a bit puzzled by the reference to 1100kg as the listings for the Meriva put it a 1200kg max tow load, ie, 1200kg+noseweight, and thats well under the 85% guidline, as a tow car it does everything it is supposed to do, and more, the only drawback is the max noseweight of 50kg and the fact that as a mini MPV it's a bit narrow and needs wide extension mirrors (to see down both sides of the van) everything else is a plus, mine as a diesel dosen't have the grunt below 2000rpm in high gear due to the high ratios but this has never been a problem once you are aware of it, although on the m/way at a steady 55/60mph the rev range is bang in the middle of the power curve, and will pull this all day long,
if you have any questions please ask we are all here to help,