T-Shirt Design

13-year Family-owned and operated RV Dealership in Summerdale, Alabama Looking for someone to design a T-Shirt for us. My boss wants someone to look at our website and come up with a creative design for the back of a T-Shirt we will get printed. www.whitesandsrv.com
Shirt to include our website URL**
Our logo is attached as well.
Need design in a vector image format to be sent to our Tshirt printer.