Congrats on your purchase! My PDI was about 1.5-2 hrs and there were a lot of things I forgot that I had to quickly learn my first time out. At 2.5 hrs you might have some questions but the good thing I learned was that this forum is very useful in finding the solutions without having to post since someone already ran into the same problem.
As for your truck, I understand how you don't want to part with your truck since it sounds like you've taken care of it since you got it. I parted ways with my 2010 F150 last year with only 36k miles on it. Max tow weight for it was 9600 and I was near 9000 loaded with mine. I was over payload and didn't like the way it towed though the hills. I traded my baby in for an F250 and enjoy the handling better as I tow the trailer while taking my family to the campground.
Enjoy your trailer and be safe!
2014 Ford F250 FX4 Crewcab Powerstroke 6.7
2014 Primetime Lacrosse 318BHS Touring Edition