Don't need the correction arms for 2in lift. Probably would for 3in and over but not for 2in.
I've got OME 'light duty' +40mm on the front and OME 'medium duty' +40mm on the rear as the missus doesn't believe in travelling light when camping!
Bear in mind that even the light duty springs are upgraded over std LR spec coils. When travelling empty, the ride is definitely on the firm side even with the tent and rack permanently mounted.
If you don't carry a lot about on a daily basis, I'd suggest the light duty springs all round would be fine for you, but have a word with Devon4x4 - they were very helpful when I was looking to get mine.
NB If you do fit a 40-50mm lift, you *may* need to fit a pair of crossmember spacers to drop the crossmember down an inch or so - the prop can catch on it otherwise. I say 'may' as some people seem to need them, while others don't - I haven't got them fitted and haven't had any problems whatsoever, however I don't do any serious offroading, just the occasional greenlane so axle articulation has been minimal if I'm honest. You will need shocks that are capable of the extra extension too - I've got TerraFirma ones on my D2, the ones that are suited to std to +50mm. And as I mentioned earlier, you'll need longer brake lines. I fitted Goodridge braided hoses simply because I've used them on previous vehicles.
HTH
