Let them know you have a gluten allergy and they have a special button on the cash register, alerting the kitchen staff to use their dedicated handling procedures. If you are not familiar with their menu options, ask for help ordering and even when they are busy, they will assist you. To get a lettuce wrap instead of a bun, order your burger protein style. They only cook fries in their fryer (no breaded products) so there is no cross contamination issue. They will give you spread in takeout packets so there is no issue with contaminated utensils or dispensers. I frequent this location and others since safe “fast food” is hard to find when traveling.