This kind of thinking is why Jacksonville struggles with its image around the country & the world. One step forward; three steps back. The visceral response is that food trucks are a threat to our beloved brick and mortar restaurants.
Anyone who knows me, knows that I support our local restaurants vigorously. But I also support anyone with a great idea and creative/great food, being able to get it out to the people who want to buy it. I don't quite understand why Jacksonville would be the only vibrant community (or trying to be) where food trucks wipe out great brick & mortar restaurants. If you've got good food and good service, you got this (plus, you probably have the advantage of being able to offer a table to sit at, and an adult beverage to consume - the odds are in your favor, not the food truck!). If your food & service ain't all that, but you're the only game nearby, consider stepping up your game and create loyal customers, rather than skating by with the bare minimum because you have a captive audience.
We've had some our of fav local restaurants pop up from food truck humble beginnings. Instead of trying to bend the will of the people of Jacksonville to accommodate your fear, consider viewing this as an opportunity to improve your product, be it food, service or both. If you're stuck in a crap location (we've all seen the locations where nothing succeeds), use this as an opportunity to start your own food truck. Consider the positives and opportunities, and let's keep Jacksonville moving forward towards the bright, vibrant city we are destined to be.