I don't know what kind of truck you have but consider a new radio for your truck. Like a double din with touch screen. mine has CD and DVD for movies and a rear view camera and smart phone compatability. You could get a rear bed light with camera built in. You can keep an eye on your rig while going down the road..
This would be an example of a system that has lots of options
http://wwv.crutchfield.com/p_130X2600BT/Pioneer-AVH-X2600BT.html?tp=20217&awkw=75619909345&awat=pla&awnw=g&awcr=47439294745&awdv=chttp://www.carid.com/cg/smoke-led-3rd-brake-light-g2-mpn-11-dr94ledg2sm.html?gclid=COG_1K3hrsQCFQSRfgodID0AUA