Right now we have a seller in EBay who sells a kit that changes the Tamiya flat bed into a low loader.
Very nice parts, powder-coated but the folks buy that thing for more than 250.- Euros, that´s about $325.-!! My opinion, a little bit too much for five metalparts, so I started to use some of the original frame parts and built the low loader by myself.
Here´s some pics:
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I cut off the rear end of the frame, used some aluminium and lowered the trailer that way.
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The parts for the front-end had to be built completely from scratch:
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So I build this trailer at a cost of $30.- for some Material instead of more than $300.-! Now I will add some details and that´s it!!