Roaming Fork is by far the best food truck I've tried in the QC. The signature item is their fish tacos, which are especially delicious in the winter when Kelly makes em with a mango salsa. The summer version with the corn salsa are quite scrumptious also.
The truck is in Ballantyne every Thurs so this is a weekly thing for me. The smoked meatloaf sandwich is bomb-diggity and the garlic-parmeson fries are a must. Several co-workers have told me the "porky-cheesy" is where it's at, but I can't vouch for it since I haven't tried it (pulled pork that her husbands smokes for 12 hrs in a grilled cheese sammich)
Great bang for the buck - go get you some.