My 05 Crew cab short bed is a 1 piece.
2005 Chevy CC, Airaid cai, Gibson cat back, Nelson tune, corvette servo, Circle D 3000 stall, Circle-D built tranny,Speed Daddy headers
mine is a one piece also
06 silverado CC Volant CAI/ Corsa Sport exhaust
dynatech supermaxx headers/cats
LPE GT2-3 cam/ Comp 918's/ Rods
Eaton LSD 3.73's
IAT Shocks
DANNY TRANNY w/2800 TCS billet verter
275HP and 293TQ Pre Cam
314HP and 303TQ post cam
my gmt900 ccsb 2wd has a 1 piece, my 2000 sierra ecsb 4x4 had a 1 piece
2007 GMT900 CCSB 5.3 VTS2300 Twin Screw Supercharger, Doug Thorley LT's, True 3" Duals into Dynomax Race Bullets, Nelson Tune, 4L80e w/transgo HD2-D, Truetrac, 4.10 r&p
Need list: Stall, PLX 200 for my crappy AFR, X-pipe, GM 20's.
my 05 ccsb is a 1 piece also
Also keep in mind that an EC 6.5' bed has the same wheelbase as a CC 5.5' bed