hey guys and gals. i have a 99 gmc ext 4*4 1500 with a worn out 5.3. i pull a 25.5' fifth wheel with it and it is a little underpowered. i have the oppurtunity to get a wrecked 6.0 2500 and i am wondering if i can just swap out the engine??? or is it a bigger job? wiring harness? tranny? and i know the 2500's have the 8 lug wheels, would i be looking at swapping the whole drivetrain. any help with this would be greatly appreciated. thnx in advance!