This is the FedEx Boxville mod! Replace the textures with OpenIV in update/x64/dlcpacks/patchday3ng/dlc.rpf/x64/levels/gta5/vehicles.rpf and replace boxville4.ytd and boxville4+hi.ytd.
and
update\x64\dlcpacks\mpheist\dlc.rpf\x64\levels\gta5\vehicles\mpheistvehicles.rpf

If you have problems, please, let me known