Yep, the 4 cyl won't cut it. Make sure you get a trailer with brakes too. If not, you will regret it the first time you have to slam on the brakes in an emergency and find your trailer jack knifed up next to your truck.
Just fyi, I had to switch from a 5.0 V8 to a strong 5.7 V8 to pull my trailer and that was before the TT was added.
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