No need to buy gap guards for a lot of $$. Go to Home Depot or Lowes to the carpet/flooring section and get the floor level kick panels you see in offices on the wall. They're made of a durable, yet flexible black rubber and are about 5" wide.
The rock hard 4x4 rear bumper I just ordered mounts in the factory position or 1" higher that factory for improved exit angles and to compensate for BL. It's not gonna cover that giant canyon you've created, but it's a start.
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