I towed about 8000 with mine and averaged 12+ mpg on a long trip last year. Never had any problem at the ramp etc... 9000 is close to its limit, so I guess it could come down to the diesel prices. The stopping power of the Titan is very good. I've had people cut me off in traffic while I was towing and the truck's brakes, along with the surge brakes on the trailer brought me a very quick stop. (then I threatened someone :angry-smiley-038:)
Can't go wrong with a diesel though...It would be the safest. Heard good things about the new Tundras as well.

I pulled my 38' Scarab with mine!!!:eek::grinser010:

I only had to tow it about 400 yards though to get it out of harms way (trees) for hurricane Gustav.

It pulled but I wouldn't go any further than I did.

I use a Chevy 2500 HD to tow it to the lake....It handles flawlessly.