I urgently need food truck operators doing event catering for a Restaurant Startup & Growth story. Details below:

STORY: How restaurateurs with food truck operations are using them for catering (showing up at events with the truck as the food prep and staging area)
Questions:
Is this a good idea for food truck operators? Why/not?
What additional expertise do operators need for catering?
What additional equipment do trucks need for event catering?
How much more staff?
What will the main challenges be?
What’s most likely to go wrong?
How much can catering operations add to trucks’ revenue?
Got some examples of truck operators doing this? How’d they do?
What advice to you have for someone contemplating doing this?