I've just got a new catalog, where some old images from the new 2H TECHNIC sets are available. So I can saw them with more detail.
I realized from the images below, where the Linear Actuator appears in two different setups, on something I saw before but always forgot to mention. It makes clear that the LA driving mechanism connection is made with an axle termination and not a U-joint as I initially imagined. :P
It turns obvious when you compare with the setup on the right, where a '12 Thoot Double Bevel' gear is in use.
Regarding the Off Roader (8297), it has written a sentence which translated means "Doors and Bonnet with hydraulic opening". It seems Ok and according to the images available for the doors, but I doubt it would be the case for the capot or even the rear door.
From the originally sized images, it is also clear that tires are in fact '94.8 x 44 R' sized, i.e. the same used at rear wheels from the 2006 'Tractor/Dune Buggy' (8284).