My Brother-in-Law has ALMOST the same set up as you do.
He has been very happy with the set up. His next trailer will require him getting a newer truck with a bigger motor and more power, but for now, he is satisfied.
He has taken his set up all over Minnesota and South Dakota for the past 7 years with now problems.
I had a 1998 Ford F150 with the 4.6 V8 pulling our 25RKS and found it rather poor on hills.
I now have a 2006 F150 with 5.4 V8 and 3.73 gears and find it AWSOME for our set up.
HAPPY CAMPING!! :D
Daryl and Sandy
2013 Eagle 314BDS
2014 Ford F150 Platinum, 4 x 4 Crew Cab with Ecoboost