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author: Faysal 
originale credit to Faysal
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installtion:
FIRST MAKE A BACKUP OF YOUR FILES 

update > x64 > dlcpacks > patchday3ng > dlc.rpf > levels > gta5 > vehicles.rpf

then replace trailersmall.yfd & trailersmall_hi.yft & trailersmall.ytd
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1: the seashark isn't drivable on water maybe in future (i don't know).
2 :trailer on traffic ai spawn only with white color ( i'm working to fix that ).
3: don't upload it on any other site or modify with out my permission and credit.
4 :small donate will be great :D 
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by Faysal