@Maury82 > I believed as you believe when I bought my 1/2 F-150 3.5EB MT. Now I know different. Your 2018 XLT HDPP weighs less than my 2011 XLT MT. I upgraded my tires and suspension but still struggled with a 35' 8600lb loaded trailer. What I lack compared to the HDPP is the heavier frame and axles. That would allow me to carry more weight but will not help with stability and sway while towing a long TT.
Don't get me wrong, it's a great truck, but it doesn't weigh enough to comfortably tow a long, heavy 'bumper pull' travel trailer. Physics is working against it. It can do it but it wasn't what I would call a vacation. Been there, done that, learned my lesson.