Well I have 2 additional trips under my belt with the same setup as last time.
The first was up to Keystone, SD over labor day. We went up I25 and over 16A into keystone. The truck handled it well. I put down about 1300 miles combined (with trailer about 800 miles and without about 500 miles). Average MPG was around 11.7 for the trip.
Notes:
If you go up to the black hills use caution on what roads you get on there are alot of low clearance areas because of the tunnels. I would recommend planning out your route very clearly.
Wind conditions through WY were not the most pleasant. I will be getting a recurve or similar sway control weight distribution hitch in the future. Overall it didnt get out of control at anytime. I will say that the ecoboost numbers worry me a bit; from my prospective an F-150 (any engine combo) is too light to handle a 10k trailer.
Trip to Grand Lake (over Berthoud pass).
The truck and trailer combo did well going up to over 11k again. No problems up or down the grades. I-40 going up is a bit slower due to the switchbacks (which is fine by me). Map time vs actual was accurate. About 10 mpg for the trip.
Notes from the trip:
No issues at all other than normal traffic (inexperienced box truck driver over berthoud). Saw some moose come through the campground. When you get to these mountain towns it is absolutely necessary to plan your fuel stops and make sure you have enough room to get in with a trailer (height and width).