I have been very happy with the way my diesel Iload tows, i have the manual and use it to tow my camper van.
I think the petrol would do the job but I remember reading a few reviews at the time I was looking at buying recommending the diesel manual for towing.
Also with the diesel the servicing costs a bit more because the castrol edge oil is a bit expensive but not to bad every 10,000 klm
I have had mine for 3 years and just clocked over 70,000 and happy so far