a agree with the DR. here is a thought as big as your truck is. go ahead and put in a full service kitchen in.
steamers, tilt skillet, fryers, range, etc the list goes on. if you have a full kitchen. then you can cook anything you want.
but i still agree with the others your are kinda going backwards.
the food truck industry is a completly differant animal. as you will see. if you have the room go for it.