I have trouble with my box moving all over the place too. Someday I'm going to have the trunk redone with a much nicer look to it.
Have to get the performance done first though.

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Performance - S1X Cam, 105# Springs, Intense 3.3 MPS, FWI, SLP headers, SLP HF cat, Flowmaster 40 Series, Res Delete, 180* T stat, Autolite 104s, Custom PCM Tune
Electronics - 2006 Kicker S12l7, KX1200.1 Amp, Pioneer 6x9s, Pioneer DEH-7700MP HU, Viper 791XV Alarm, Aeroforce scan guage
Apperance - SilverStar ULTRA, Custom Chrome Grill, Woodgrain Dash Kit & Steering wheel, 18" Daat-59 Rims, Toyo Proxes4 tires
PB 14.93 @ 95.39 2.32 60' ..before the cam