I certainly don't think it feels like the engine is being limited by something. I have a 2009 TRD Sport, and when I want to get goin, just mash the gas pedal to the floor and that thing takes off. I am coming from an Infiniti G35 too. I think these trucks are quick for what they are... trucks. However I did go through the recommended break-in noted in the manual. That limits RPM up through 1000 miles. But ever since, I'm quite happy with the performance!
It's my understanding that Toyota came out with the TSB to allow you to haul the advertised amount without bottoming out. Depending on how much your trailer pulls down the back of the truck, I dont know if the TSB would help as much when towing as it would when actually loading up the bed.
But yes, if you are going to be hauling to the truck's limits, then you'll want the TSB.
Congrats on the truck. I've never had a frontier, but I sure don't care for their looks. They're too small, too low, and not nearly as aggessive looking! Good choice in going with a Tacoma :thumbsup: