The Trail Manor should be level - same distance between the ground and the frame, front and rear. You're right. Get a raised hitch.
The tow vehicle is another question, the subject of much debate here on this board. With a tow vehicle rated at 8000 pounds, you probably do not need a weight distributing hitch (WDH) - you just drop the trailer's coupler on the ball and go. (By the way, I am referring to a REAL hitch on the tow vehilce, not a hitch ball whose stem is dropped through a hole in the bumper.) But some F-150s have a real short wheelbase, which might push you toward a WDH. The theory is this. When you drop the trailer 's hitch on the ball, the rear end of the tow vehicle will sink from the added weight. Everyone knows that. But the front end of the tow vehicle will rise - not everyone knows that. And with weight taken off the front end, and the front end raised, the handling will be squirrelly. With a big tow vehicle, the rear end doesn't sink very much, and the front end doesn't rise very much, so you're good to go. But if you have a short wheelbase tow vehicle,
even if it is rated to tow a lot, the front end will be sufficiently unweighted to cause squirrelly handling. In that case, you need a WDH.
So how do you know? With the trailer unhitched, measure the height of the front and rear bumpers above the ground (or the front and real wheel wells, it doesn't matter). Now drop the trailer's coupler onto the hitch ball, and measure the two heights again. If the front rises by a half inch or so (there is no magic number) and the back drops by an inch or so, you're probably OK as you are. If the front rises by more, you may be a candidate for a WDH. In the ideal situation, the front and rear will both DROP by the same amount.
See a bit more detail here
http://www.trailmanorowners.com/foru...ead.php?t=2922
and here
http://www.trailmanorowners.com/foru...ead.php?t=2616
Bill