Engine/Transmission (1998.5 - 2002) Need a new turbo, which one?

[SGCLark]

This is my first post. My turbo is putting oil into my air to air which has been causing alot of blowby. Doesnt use any oil. Im going camping and will be pulling my camp trailer. My 02, auto, 4x, 3. 54 is stock but I intend to upgrade only to the point that I can pull trailers and not melt the motor. Will be pulling up to 11,000 ft, live at 4,500 ft. , up to 12,000 lbs. I do want a faster truck eventially, but reliable for towing. Which turbo and about how much are they? How did you guys get that lower back nut off?