Certainly the recommendation for the 2.4 JTD is to go for the Extra Load capacity.
Most people go for Goodyear F1 GSD3s and they are only available in Extra Load in 215/45/17 anyway. (91 I think). The V6 is a similar weight, so it's probably advisable.
Yes I'd recommend going for the XL rated tyres too.
Strictly speaking the XL rated tyres should also be run at a higher pressure in order to meet that rating.
The std pressures are between 2.2bar & 2.5bar (the higher figure for full load).
The XL tyres should be run between 2.6bar & 2.9bar (the higher figure for full load).
But you may find that 2.5bar will be enough.