Glad to have you here on irv2.
You trailer is really going to weight a lot more than the 4600# once loaded. Probably closer to 5500# which will be pretty good load on your F150.
The biggest problem with your F150 is the 3.55 axle. If you had a 3.73 axle or better a 4.10 axle, the truck would do better.
I am presuming that the Terry is a TT and not a 5the wheel. If it is a TT, the F150 will pull it, but do not plan to win any races, even down hill. Also, it will have a great affinity for gas stations.