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This twin steer, triaxle bed is based off the type used in heavy construction or off road oilfield trucks. I do offer a bed for this frame as well, or one can scratch build whatever he likes for it. There also is a set of tires for the piece, but one would need to buy two sets due to the third axle. Should there be a problem, contact me via the designer link or direct via email to firstname.lastname@example.org