Towing ~8000 with new F150.. fun or scary?

There is really no debating that both trucks will tow the weight of the trailer just fine. However, consideration should be given to the following. While coming home yesterday on I-81 south just north of Harrisburg I was pulling my 30' trailer and a F-150 came on the highway just behind me. 5 miles down the road it looked like he was going to make an attempt to pass me. Mind you I was already going 70, it was not terribly windy but it was noticeable and the gusts were enough to get your attention and keep you honest. I check my mirrors after one such gust to find him in the verge of loosing control of the truck and trailer. He was all over the left lane and swaying into and out of it on both sides while I just kept going along. Could his hitch been set up incorrectly? sure, but there is something to be said for having a heavier weighing tow vehicle keep things steady.