All depends on how much you fancy spending ;)
This is a pretty good list of off road rubber
Simex Extreme Trekker & Jungle Trekker
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Mickey Thompson Baja Claw
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Interco Super Swamper Bogger & Irok
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Pro Comp X-Terrain & Mud Terrain
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BF Goodridge Mud Terrain, Mud Terrain KM2 & Krawler
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Khumo KL71
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All of those are super tyres and original's
There are copy versions avalible of most designs.
:D