I'd like to ask a big favor of someone. I will (hopefully) be closing on a 2020 GMC 2500 AT4 later this week, right before I head halfway across the country for the holidays. Unfortunately, the dealer can't get the tonneau cover I want in before I leave. Thus, I'm going to put together a makeshift one for the trip and will get the Diamondback HD installed when I return. But could someone take a couple measurements for me so I can get started on this today instead of waiting until last minute? Essentially, I need the outside and inside length and width dimensions of the truck bed from the top. I attached a quick example of the four measurements I need. Anyone's help is GREATLY appreciated.
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