I received a response from Nerijus Strumila, the owner of the Jeep:
We took Jeep Wrangler Unlimited 2.8 CRD automatic transmission.
I just put on BF Goodrich tires - that's it, no more modification had been made.
Unlimited (means 4 doors) and you can make 200 cm bed in back of Jeep, so, no...