Truckers' trucks (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">truckers' trucks</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rigs that I've seen before include "Oil-drilling platforms" , "Falsifies" , "Costumes; fraudulently manipulates (election)" , "Sets up (equipment)" .)