Great work! There desperately needs to be some mechanism to view the gold and goods (maybe equipment as well?) that another person is carrying. Whether this is free or not, or exact or not, is up in the air, but at least some way to ballpark estimate would be great.
EDIT: Also, the amount of stuff you're carrying should also slow you down. I say this because if you want there to be any sort of banditry, you have to have some way for a group with more troops to catch up with a group with less troops. Ambushes don't seem very practical. Some sort of raid option for attacking a larger group with a smaller group for profit might also help.