I doubt if this has any relevance but the C550 which is variant and believe has the same engines as the 501 can carry 14,500lbs in certain forms.
lbs
Just for Clarity. The 501 has a MTOW of 11500lbs and 2200lbs of thrust per engine, The 550 has a standard MTOW of 13300lbs and 2500lbs of thrust per engine.