The tensile strength of aluminum (t-6) is between 40-72 KPSI and can be as low as 6 KPSI

Stainless is at least 70 and is usually in the 150 - 200 KPSI range. If you are using an aluminum Beaner for the trap line then that is about what they were intended for. I would never trust any stressed rigging to a beaner designed to hold about 3 or 400 pounds. Sails have thousands of pounds of force on them, the sheet on my I20 is 8:1 and I pull about 50 lbs in good wind that makes the force about 400 lbs at the attachment point and about 2400 Ft/Lbs for the boom. rough math but I think the point is use what works because waiting for a tow from a stink pot with your mast in your lap is real embarassing.