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Diagonal maybe, but front fender and pipes will probably hit the side of the bed.
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Hours after I posted this (from personal experience with a similar-length bike), I watched someone unload a bagger from a 6.5" bed. It was pretty straight, but the rear tire contact patch was pretty close to the rear end of the bed. Hope it works for you.
I put my Ultra in the back of a Toyota \\;Tunda \\;for Daytona, yes I trailered, it was 8* out when we left Orange county, NY. \\; I put it on a slight angle with 4 point strAP . jUST CHECK IT EVERY 150 MILES OR SO