Under 3000, what do you like in a hard side TT

WTW, it looks like the 19ERD should tow okay with your F150. Your fuel economy will drop like a rock, but that is the case with most vehicles towing a barn.

Watch the tongue wt, and as said, use a WDH, and you should be okay. Long uphills may heat the engine, but use Tow-Haul, and it should manage the temps okay. Just seems to be a small engine, to me, to be towing a full-height TT. Doable, but I wouldn't want to go any heavier.

Happy camping!