Yes easy to do on a 99 and up 7.3 with tuner. But my 97 does pull my 12,500 lbs with no issue at all, But mine is not stock. K&N Intake with dry NAPA Filter (Tymar) 4 inch MBRP exhaust, TS 5 selection chip set. stock, Hi Idle(Warm Up), 50 hp, 75hp, 100 hp. I run the 50 hp all the time because that is all I can get from my stock injectors without more modifications. Get hand calculated 20 mpg on my mixed commute and estimate 12 to 14 mpg towing. I did a gear change from 3:55 to 4:10 this made a much better towing machine due to better RPM and gear match.
Also have larger Trans cooler and Gauge pod with EGT, Boost and Trans Temp.