Man I feel what your going through, the insurance adjuster just came out today and told me my DD is totaled. He told my I probably wont be getting much extra for the shaved tailgate, rollpan, aftermarket wheels or cd player. He said it only brings the value up a couple hundred bucks because its depreciated value.
My suggestion to you is get everything that is aftermarket off the truck. So you can sell it outright or just have it on hand.
2004 Gmc VHO (LQ9), AEM cai, perma cool e-fans, aero turbine 3535,obx lt's,undedrive pulley w/overdrive alt pulley, lingenfelter 160 t-stat, zippy tune, taylor 10.4mm wires, tb bypass, Transgo HD-2 c, corvette servos, sonnax accumulator piston's,2600 stall,30,000 trans cooler lowered 1.5"/2", boss 313 22's on 285/45's, rollpan,shaved tailgate w/ss spoiler, painted interior, 2 solo l7 12's,custom fiberglass box,Pioneer F-900 Navi,SSS gauges,billet shiter and pedals,hid's (low's and fogs).