65' Max Length

I've done a bit more research and I've found that, apparently, the GN "swing clearance" varies quite a bit between manufacturers (and maybe trailer types?). Check out the three attached examples. I've seen GN swing clearance lengths from about 88" to over 100".

Here are calculations I'm concerned about for my truck, a 2010 Super Duty long bed crew cab:

780" (65') - Max allowable truck & trailer length (But not a tractor as Espressolane pointed out)
210" (17' 6") - Minus front bumper to GN ball (wheelbase) (approx; ball is slightly forward of the axle)
480" (40') - Minus trailer deck length
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90" (7' 6") - Equals the maximum GN swing clearance I can have to remain "legal"

So to my original question, I'm trying to figure out how difficult it is to find trailers to keep long bed crew cab Super Duty hotshotters within legal length. Essentially it's just a matter of finding out the swing clearance of every trailer I'd consider buying, and if it's over 90", I can't use it. Or I may have to special order a trailer.

EDIT: I just measured the swing clearance I NEED on my truck: 85"

 

No, but I figure I'll eventually find a quality 40' trailer with everything I need--and a properly sized gooseneck.