Kanetoads
It's very easy to underestimate modern bizjets, in testing the 680 got stopped in 1200ft ground roll at max landing, it's got the same brakes as the 750 which weighs 6k lbs more.
Whether you believe them or not is up to you but to call BS without the AFM to hand could well leave you with egg on your face.
I was Asked to visit Ganderkeesee in February but declined and went to Bremen, the boss is still moaning about it now, if the AFM says it's doable, the insurance is valid you need a reason to say No and since when does the boss apply logic to what he asks you to do?