This Is The Main Mod: https://www.beamng.com/threads/revamped-crd-monster-truck.55253/
Some Addons: https://www.beamng.com/threads/crd-monster-truck-bev-skin-pack.52360/ https://www.beamng.com/threads/paint-jobs.33370/ https://www.beamng.com/threads/map-discussions-and-downloads.33445/ https://www.beamng.com/threads/human-crd-addon-pack.39301/
Note: You Need To Make An Account To Get These Things. Or If Not, You cant get em.
Edit: There's Also A Group That You Can Join, Wich Talks About Monster Trucks In Beamng:https://www.beamng.com/groups/beam-monsters.477/groupinfo You Also Need An Account To Join Into This Group,