Pop the rear window and run some rope or bungees around the frame and secure it under the rear somewhere.
You should be fine as long as your not driving long distance or on the highway.
2014 - Altitude - Billet Silver
DDM 5k HID, VLed 5k led fogs, 15% tint, Mopar Slush Mats & Cargo Mat,
Black locking lug nuts, Black Overland Mesh Inserts
Next: 1.5" Bora Spacers, JL 250/1 & Stealth Box, Trail Hitch