I have a question that possibly someone could help me with. I'm new to the forum so bear with me. I am towing a small 3900 pound travel trailer with my new 2011 Titan Pro 4x. (The truck is equipped with tow package, tow mode, etc.) The truck performs fine until I hit 4th gear, then it bogs down and loses RPMs immediately and I end up back in 3rd gear. The truck flies in gears one through three, but it really hits a wall in 4th. When it shifts to 4th it drops about 1500 RPMs. I have two questions. 1) Is anyone having this no power in 4th gear problem with a light load like this? And (2) Will it hurt the engine to run at 60+ miles an hour in 3rd gear at 3500 rpms for a long period of time? Any help would be appreciated.