Safely towing a 27ft tt with nissan frontier crew cab

Aside from the weight issue, I think that the 2 biggest issues you will face would be the truck's wheel base and the height of the travel trailer. With a light truck and short wheel base you will probably encounter sway issues with the tail wagging the dog. Also, given the height of the trailer acting like a huge brake you may have difficulty maintaining highway speeds. I am sure your truck would pull a 4000 lb cargo or flatbed trailer, but a travel trailer is much taller.