Hi Jo-anne,
We tow a 1200 kg (when empty) Ace Award Northstar with our Sedona. Towed with the Sedona for the first time since buying new last weekend (Cheshire to Somerset & return), and can recommend the cars towing ability and comfort. It was fantastic! Plenty of power in reserve, and @ 30mpg whilst towing. 100 times better than the Terrano we traded in.
Unless you're buying new, go for as late a model as possible for the best spec. Ours is the LE, 2.9 diesel, which was on special offer, and might still be if you are quick.
Not sure of the max weight, but I've seen a few pulling twin axles with ease.
Good luck, Mark