Should be a balanced deal. 1 may carry a little more than the other. its like balancing a 2x4 on a pencil. Tongue weight plays a big part in the placement. 7-10 percent of the GVWR .
Some people get new trailers, work on their own or have dealerships work on them and tighten down the shackles and equalizer bar too much. hence not allowing it to rock and balance. We tighten them all the way down then remove the wrench and free spin them with an air gun.