Install:

ALL VEHICLE FILES: (Including trailer) goes to Grand Theft Auto V\x64e.rpf\levels\gta5\vehicles.rpf\ and \mods\update\x64\dlcpacks\patchday3ng\dlc.rpf\x64\levels\gta5\vehicles.rpf

FOR SOUND FILES

In OpenIV, copy sounds to x64/audio/sfk/STREAMED_VEHICLES.RPF

Then, replace rig_2 with the OAC file within the folder.

MAKE SURE YOU COPY THE FILE TO A FOLDER ON YOU'RE COMPUTER BEFORE EXTRACTING, YOU MAY END UP WITH ERRORS OTHERWISE!

VEHICLES.META: goes to Grand Theft Auto V\update\update.rpf\common\data\levels\gta5

HANDLING.META: goes to Grand Theft Auto V\update\update.rpf\common\data

CREDITS:

IAmGtaBoy for the Cummins engine sounds https://www.gta5-mods.com/users/IAmGtaBoy

DeezNutties123 for the 2010 Dodge Ram 3500 & PJ Gooseneck trailer https://www.gta5-mods.com/users/DeezNutties123

DeezNutties123 for the 2008 Ford F350 Superduty https://www.gta5-mods.com/users/DeezNutties123

bagged for the Dodge Mega Ram 3500 HD https://www.gta5-mods.com/users/bagged

Personally i have never got the gooseneck trailer to work, DeezNutties123 told me to just rename the normal yft the _hi.yft i still could not get it to work my game just crashes upon spawn
so try at your own risk!