info on turbo build

[03whitez71]

So here it goes;
http://www.ls1truck.com/forums/showthread.php?t=39460&p=437780#post437780

Thinking about buying that turbo and putting it on my stock 03 z71(well has k&n cai and flowmaster exhaust and some kind of a programmer [the reason I say this is cause I can run past 98 mph and I believe chevy limits it trucks to 98 from factory]). I have 33 inch tires and 3.73 gears with a stock 4l60e, and I tow a 3-4k trailer 2-4 times a week. I am wondering if it would put to much stress on my transmission, and also would I need bigger injectors if I run low boost(5psi). Would I benefit much from a cam swap, and also what about tuning? Is it hard to tune with hp tuner? I never tuned before but I catch onto stuff pretty easily, so is it a good idea to do this? Also truck has like 101k miles.