There are 3 outcomes:
1)He kills you ad takes the items
2)You kill him and take the items
3)You manage to trade with him
To stop 1 from happening you bring your goons to back you up
In case you have more goons than him you can either:
A) Lead to 3
B) Lead to 2
In case 2 happens the situation branches to 6 possible outcomes:
1) His goons are better than yours
2)Your goons are better than his
3)Both goons are at the same level
4)Your goons run away
5)His goons runs away
6)Both goons runs away
3 and 6 are unlikely
Chances are, if you are the one who proposed the trade, 1 or 4 happens
If its the other way around, 2 or 5 happens
In all situations you will be targeted first and you will die so I suggest you go to the meeting naked and put full tradition
OR
All of this can be avoided by making small trades first with people you dont know and then making the big trades
Following the rule of haven and hearth, chances are that he will try to kill you