Originally Posted by hayhauler
No plans to change RVs, this one is doing well for us.
If by "RVs" you mean both truck and trailer, then the problem is cost of hot-rodding your old Chevy to have more power and torque without decreasing the longevity and reliability of the truck. Yes, it can be done. but not cheap.
Before you add a "towing" tune, you must have gauges - pyrometer and tranny temp gauges that show numbers, not just color ranges. Drive by the gauges and NEVER
allow more than 225° tranny temp or 1,250° exhaust gas temp (EGT).
Next you need to improve both intake and exhaust systems to provide a free flow of air both in and out of the engine. For the exhaust a minimum of replacing the muffler with a straight-thru performance muffler (but not a racket-making illegal straight pipe). Even better is a cat-back custom performance exhaust system designed for your engine.
Then after you have the intake, exhaust and gauges, you can look for a towing tune. BullyDog makes generic tunes that may be better than stock tunes, but not much better.
Much better is Banks. They have several different products for your engine, beginning with the AutoMind programmer:
Banks Power | 1999-2013 Chevy/GMC - 5.3 >>AutoMind® Programmer
Sierra/Silverado 1500, Suburban, Tahoe, etc.
+ 14.9-25.1 HP
+ 15.4-33.5 lb-ft
Note there are no wild claims of HP or torque increases. Banks won't sell you something that will reduce engine longevity or reliability. But 15 to 25 added HP will "wake up" your engine, and make towing much more pleasurable.
Even better is the Banks Power Pack or Stinger kits, that include intake and exhaust mods along with the AutoMind. Not cheap, and you can probably get similar intake and exhaust systems for less money if you will become expert in where to look.
After you price the Banks Power Pack or Stinger kits, you'll understand why John and I recommended you skip the towing tune on an older pickup. They are a small percentage of your investment in a newer truck worth $30k to $50k, but an extravagance on an older truck unless you plan to keep the truck "forever".