Hey, I work on scales professionally and I can tell you that when a scale has more than one load cell, we use a summing card (junction box) to connect them all. There are typically 2 types of cards like this Signal trim, and Excitation trim; the trimming is just potentiometers used to balance the voltage from either the Sig or Exc bridge so that all of the load cells dead load output is within 0.1 or 0.2 mV of each other (rule of thumb, just get it as close as you can) you can then use a single interconnect cable from your summing card to your indicator to represent the weight no matter where it is on the scale.
--Also, a scale for weighing your self like that is typically done with just one load cell anyway, usually a 'single ended beam' cell or 's' type if it has a pedestal, that is attached to a firmament and the weighing surface (with shims at the physical contact points [<-important])
--Lastly, if its possible to check most load cells come with a rating like "3mV/V" etc.. the technical specification that comes with the SPECIFIC load cell usually is a bit more accurate it will say something like "3.23mV/V" or "2.98mV/V" (2.9-3.3,a consistency and closeness to 3mV in this rating cell to cell (if you have a bunch to compare) is a good quality indication of the manufacturers process) --Anyway-- so long as that value for all four are within that 0.1-0.2mV range you don't need anything more than a terminal strip to sum the cell outputs accurately--though it may be tricky getting a decent calibration if these values are too far apart, If they aren't close enough you'll have repeatability issues with your weighments and depending on the extent, a tough time getting a stable count for calibration.