I seem to remember seeing the individual component weights somewhere, but I can't find them on the Equalizer or other site.
If I remember correctly, all of the spring bars were progressively thicker/heavier (as you'd expect).
The heads were also progressively heavier, with the exception of the 10k & 12k heads which were the same. I think you can upgrade from 10k to 12k by only upgrading the bars.
But again, I would confirm that with customer service first.
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller