Maybe moving the passenger seat as far forward as possible will give you the few extra inches you need.Of course it folds down.
My Stihl is 73" long (6 foot 1")
My DeWalt cordless is 78" long (6 foot 6")
I forgot to measure it while I was looking at them, but the specs on paper say it's 70" in length in the cargo area.
May be able to place it diagonally... I dunno. I'll figure something out.