Vehicle Kit

How secure is a kit of 4 inches of lift on the road?
My son recently installed a 4-inch kit lift in his jeep. Is their only vehicle and my question is, how safe on the road. My concern is on long journeys of 8 hours or more. Should I be concerned about your security?
I would not worry if UAS does things with the car before I put a 10 on the lift kit on my 85 chevy 4×4 short bed and a little rigid with the bumps, but it does very well on the road.
Vehicle Survival Kit Part 1, Equip 2 Endure Survival