Hi Steve
Payloads are as follows: T200 625kg, T220 825kg and T230 900kg
350L = 350kg plus frame etc, plus fuel (full tank around 55kg) you = ??, plus any other bits you carry.
Simple answer: In my old T200 I used a 350l flat tank with 2 poles, a ladder and a few trad tools, fully load came in around 525kg so all was fine, I actually upgrade to a 500L tank which was borderline, trouble was the 75ps engine struggled.
HTH
John