Not too hardcore but anyway

I'm building a trailer for a guy at work. He wants to use a Hard Tonneau cover from a ranger as a top for the trailer. Problem is that this cover is a few hours drive away locked in storage and he has the only key. I'd like to get started and don't have any dimensions for the cover. can any of you guys give me some numbers for one?

Thanks

You'll have better luck getting measurements if you know the year/body style of the Ranger.