Since the game has become more and more solo oriented, you could make a rental cash shop cart. It must be smaller than actual carts (max 50 items/3000 weight, for example). The same rental item should expand a merchant's cart cappacity or attach to it (lol, cart train) so that merchants can also benefit from it.
It's terrible to solo ET on Warlocks, with ~20 STR, carrying 4 armors, 3 garments, 3 shields, 3 pairs of shoes, 5 weapons, consummables, gemstones, etc. on a 100 item max slots.
Edited by Kusanagisama, 22 August 2017 - 12:05 PM.