2015 26RBPR premier ultral lite F-150 towing questions

With the payload and tow capacity, I would do it. Like I said before I towed with a 5.4 liter 150. My Premier is a 31bhpr which is 6400 unloaded and 8000 max. It towed fine including the White Mts of NH. So your trailer is 5-6 feet shorter and lighter so I think you will be ok. The reason for the 350 was not to tow although it tows great but just something that I wanted as a reward so to say.