What vehicle is your TV? Tuners can and do help with towing as they improve the engine tuning and transmission shift points.
Just an example, 5Star tuning for the 3.5 Ecoboost gives, on average, 50 HP and 50 TQ to the wheels. These are dyno'd results, not fictitious claims like a K&N air filter.
Hemifever tuning with a DiabloSport Trinity tuner on a 5.7 Hemi will get you around 30 HP and 30 TQ to the wheels. Shift points are also dramatically improved.
Most modern engines have plenty of headroom for intake and exhaust to get air in and out. They are simply tuned down to comply with fuel economy and emission standards.
If you do decide to get a tuner I'd recommend spending the extra bucks for a programmable tuner with custom tuning. Like the DiabloSport tuner with HemiFever tuning you get lifetime tunes from HemiFever. They'll send you custom tunes based on your application, be it towing or performance, and tailored to any mods you'd have, like intake or exhaust work.
2013 Ram 1500 Laramie 5.7
2015 Flagstaff 27VRL