thanks for the tip! just finished mine up installed as you posted, had some 1" bolts and 1/2" spacers for the bottom from other projects. Just to add to the thread, in camp/cook mode a Camp Chef Rainier fits nice and tight in there, just leaves enough room for the fuel.
I mounted the box directly to the tailgate without the plastic cover and it fit just fine. I used weatherstripping along the back of it to avoid any squeaking.
I shortened the spacers by more than half, but you have to have at least some of the spacer to get through the plastic trim. You are right about the full spacer. It really makes no sense. That gap was huge.Honestly, not sure what the point of keeping the plastic on with the spacers, versus just going straight to the tailgate with plastic removed like others have above. You lose the gap between the box and the tailgate and it gains a little more cargo room.
Now that does make sense.isn't the purpose of the gap to allow air to flow out through the tailgate vent (behind the tire carrier) to reduce the interior pressure on the soft top windows while front windows/top are open?
there, I did it, I got it all out in one sentence.