This is a very, very large, 4wd almost fully 3d printed vehicle (the axles, springs, motors and some screws are not 3d printed).
A video of it showing its speed
...Plus is here https://youtu.be/PbDKhWGhZAw .
I've included the Rhino file so you can edit it how you like.
It can skid steer like a tank and articulate around a centre pinion like a loader.
You can see a video of this strange combination here:
https://youtu.be/6YNzH0Ci6As
The advantage of this is maneuverability at lower speeds (skid steer) and efficiency at higher speeds (articulation).
It also has independent suspension, with a motor in the hub of each very large 'drifting' wheel, which would also fit http://www.thingiverse.com/thing:1024399, http://www.thingiverse.com/thing:470486 or anything else with a 12mm hexagon coupling (like the Dagu Wild Thumper wheels), but to print these you would need a very large printer.
If you are going off-road, stick with rubber tyres, but if you are driving on grass, sand, rubber, carpet, the large printed wheels are good fun.
You will notice it is similar to http://www.thingiverse.com/thing:1024399. That is skid steer only and in this version I have improved the suspension and the wheel carrier (motor mounts) which are now much stronger. You can see the better arrangement in this video: https://youtu.be/CsUW8GbgfBI
With rubber tyres, this thing has a very impressive towing capacity. With small rubber wheels fitted, it will tow you (slowly) if you sit on a skate board.
