A 3/4 ton gas truck will pull what you have easily but (and you probably already know this) they don't get very good fuel mileage. I have one but don't put many miles on it. If you don't mind the poor mileage a gasser would be an excellent choice. If you don't mind spending more money a truck with a diesel would be an excellent choice and get better everyday mileage than the gas.
I know you said GMC but a F150 HD with a 3.5 Ecoboost will pull your TT without breaking a sweat and will get good everyday mileage also. If I had a smaller trailer that's what I'd get.
