Back in 08 I zip tied common household screen on the front of the grill to protect the radiator from bugs & rocks. It is still there. Easy to brush the bugs off no matter where they were collected.
To protect the headlights I used bubble wrap. Did not get any damage. Effective? The lower part of the trailer front got bubble wrap taped to it. The truck has very effective mudflaps.
Second & third trips to Alaska nothing special was done. Keep a distance from vehicle in front. Drive slow & slow down & get over when meeting another vehicle.