Shorter wheel base will make you "feel" the trailer behind you. That's a small trailer so maybe you just have unrealistic expectations of what the 6.0 is supposed to do? GM doesn't build them to win races, I know I couldn't beat civics with any of my 2500HDs. Put your foot into it more if it feels sluggish. We've had 5 6.0s since 99 when they were introduced and except for the 2001 1500HD all towed the travel trailers just fine. Only reason the 1500HD wasn't cutting it was the rear end. 2002 2500HD with 6.0 and 4.10 rear end towed exact same trailer night and day better than the 1500HD. 7k-9k trailers over the years. As mentioned previously a lot of people are afraid to put their foot into it and let the engine wind out. It won't hurt a thing, let it rev. Good luck, hope you get things figured out.