The trick with a funnel cake is to get one to share with several others. I think eatting one by sitself must be in the 4000 calorie area.
Sharing would also leave room for everyone to sample one of those deep fried somoa cookies.
I've yet to try the fried greenbeans but would probably do that if it came with a great dipping sauce.
I don't do fairs - county or state. And when we travel for art shows we rarely eat at any of the vendors that book the same shows (we've seen a few too many unsafe food handling examples). We always pack food for the day - lots of protien and energy foods to make it thru the day and then splurge on a great restaurant in the evenings with friends (if we had good sales).
I do think about having a food vendor trailer and selling crapes. Breakfast and dessert style. Bonus if I could swing transforming a little vintage trailer into my vendor trailer.