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.
2008 WK Laredo 4x4
RC 2.5" Lift, Bilstein HD, Monroe LL, 265/70/17 General Grabber AT2, JK Moabs, 1.25" spacers, K&N 57 Series, PW Mod,
DDM 5k Lows, VLED 6K LED Fogs, Stillen Covers, 15% front tint, BA System, Infinity 3.5" dash, JL Audio 250/1 & StealthBox