Haev a look at "uksorento.com".
We've had our 05 Sorie from new and she tows our Wyoming, nearly 1700kgs with ease. She's heavy mind you but you'll appreciate the weight, no bow waves to talk about. The Sorie in my view wil be a good match for your Elddis.
The pre face lift had a Sachs self levelling suspension worked by the shock absorbers. The facelift has the uprated engine but no self levelling suspension.
I agree with Gilbert go for the newest model you can and try and get the XS or above, they use a different 4x4 system which I think is far superior to the XE.
Cheers
Dustydog