Custom built - rock solid Rock Crawlers and Racers Chassis

Bad ass tubes

with attitude!

Tanner 4x4 and RMX Motorsports build the highest quality off road vehicles on the market today!


You won't find any "cookie cutter chassis" here !

We specialize in one off customer specific crawlers and racers. Whether your modifing your old CJ or stepping up to a single seater - two seater - four seater or even a rock bus we have got you covered. We use bullet-proof top of the line components and have the design expertise and the fabrication skills to fulfill your needs!


Tanner 4x4 Inc. Doin it right since 1974!

Check out our past Projects


Use the links below to get a more in depth understanding of our custom rock / race crawlers.


XTV Series - Single Seat Racer

The Perfect single seat buggy with Low Center of Gravity

Adrenaline Shot

Twin Seat, Mid-Engine Rock/Race Chassis

Adrenaline Rush

Front Engine Crawler for Race or Recreation


Tanner 4x4 custom built chassis

For the most part , all our chassis can be considered" dual sport"! Most of our customers use their buggies both as their recreational wheeler and as their competition rig! We have designed our chassis' with this in mind. With the exception of our single seat race cars , our chassis are designed to provide usable space for racks to carry coolers, camping gear, tools or what ever you need.