veryt tight. I'm not sure I can get a 4x8 sheet to lay flat. Charged 300 for dealer add-on. $200 or so saved vs rhino or line-x. But, I better be able to get 4x8 sheets in otherwise what??? Measures almost short of 48"

 

Two points here. First, drop-in plastic bedliners should be about $150. Second, most people don't realize that drop-ins take up a lot of room in your truck bed!