After running for about 25~ hours total now (not straight!) there has been two times where i have come to check on this to find out that its idling at the blue dragons (taverly) because there is no Falador tellytab. I had over 300 in the bank at the time so not sure why it didn't withdraw one. nonetheless a great script and it has already earmed me a great amount!
i worked around the food situation just by adding more food it takes per trip. im only 70 defence doing taverly blue dragons and i used 15 salmon per trip although one trip it did it used up all the food before completing a full inventory and just idled there. It seems to be running just fine right now.