When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
By looks my guess is a 2” lift. 120 km/hr is at the upper end of comfort on these, especially with a lift.
Also, I don’t know what your Turbo does, but a 1.2 ton trailer will definitely make a normally aspirated Disco sluggish.
If you need a vehicle to be drive nicely at 120 km/hr, and tow a 1.2 ton trailer with ease, I was going to suggest a 3/4 ton diesel pick-up (bakkie), but I see you’re in South Africa so I’m not sure what to recommend. The D2 won’t easily meet your needs.