The 550 Ultra will be heavier than the 400 I have now. My Tacoma is rated 3500 lbs so I should be alright don't you think? (Tacoma Prerunner with the 2.7)
Gosh, a 2.7? Giant engine! Had absolutely zero issues with my 2.4 Honda. Even done some serious towing on gravel switchbacks in west va. You will be fine.