The equalizer bars allow a multi axle trailers tires to step over different terrain but that doesn't mean all tires on that side carry the same weight while articulating. The trailer would have to be very nose high to place more weight on the rear axle though like we see at the start of deer season a 4wd pickup with tall off road tires moving a buddies 5er to the deer woods.
Or from NE OK to western CO during elk season as my neighbor found out. He calls me from Raton NM and says the rear axle tires are worn almost smooth...whats happening. He had put 38" mudders on his '08 3500 srw Dodge 4wd to pull his inlaws 26' 5er with 14" D load tires off road getting into the hunt camp.
I've found my tri axle trailers when out of level can place more load on the axle closest to the low end than a tandem axle trailer.