I used to work at a Culver's. They take a lot of pride in preparing each meal when it is ordered. The custard is much better than regular ice cream when it is fresh. If you have allergens, they will prepare some fresh custard straight from the custard machine so you don't get sick- just ask and they will.
I have celiac and my go to is freshly made chocolate custard with PB cups and marshmellow sauce- all gluten free. Many of their candy and sauce toppings are gluten free as well. If celiac/GF, stay clear of toppings with Graham cracker or crunchy elements and cake mix-ins (kit kat, twix, cheesecake, brownie, etc.)
Service is always friendly and tables are almost always clean. If you order coffee they are happy to brew a fresh pot.