Just avoid exploiting overvalued items...
I believe it's necessary to be able to pick up items above your carrying capacity to be able to buy really expensive items, like masterworks quality large armor, as it requires a huge stack of furs to cover the cost, and foreign traders ONLY accept fur as payment. I use a cow of burden to haul the furs to the traders and then unload the furs onto my character (or the ground and then to my character) to be able to cover the cost.