2002 chevy tahoe 5.3 3.73 gears. K&N cold air intake DynaMax cat. back exhaust

 

a real person
there're so many vendors on here who write good tunes - BlackBear, Atomic, Wheatley, and more.

welcome to the site. there's a wealth of knowledge on here... and a lot of worthless banter

 

At stock power level with stock everything else a tune really won't make much difference in how it tows that trailer.

Re-gear that truck if you want a change you will notice, then get a tune to make the transmission function correctly with those gears.

 

 

All true, but I'd probably start with gears and a tune. 4.10 or 4.56.

 

4.56

Roots blower

I know I sound like a broken record, but its a proven combo, time and time again. cheap too. You could do it all for 3-3500 if you shopped around, got used stuff and got a good deal on gears and install. Deeper gears save the trans too.

 

Everyone saying you should Re-Gear is correct.
4.56 gears, and a PD blower will be your BEST upgrade for towing.