Use Open IV to replace
update>x64>dlcpacks>patchday3ng>dlc.rpf>x64>levels>gta5>vehicles.rpf

Remember to always backup!

Model created by Fighting-G

Paintjobs created by me

Original 2012 Cadillac Escalade ESV:
http://www.gtainside.com/en/gta5/cars/78544-2012-cadillac-escalade-esv/