Replace a load bearing wall
I would think your best bet is to contact a structural engineer or the mfgr. for load information. I don't think anyone here wants to take a 'chance' on giving you bad information, even if they have GOOD intentions. I'm sure there are other variables to consider in the calculation.
For the money it costs to get Professional Advice, it's certainly a LOT cheaper to pay than it is explaining to the Home Owner why the 2nd floor and attic are now on the 1st floor. (Good luck collecting from the Insurance Company.)
My best to ya and hope this helps.
Jay J -Moderator
PS: An Architect may be able to help, or at least point you to an Engineer ...