If you have the max payload/tow package, you might be legal and within specs of the truck. I know the newer F150's are available with pretty high ratings.
I haven't towed anything that heavy with a 1/2 ton, but my previous experience shows me you can't have too good of a hitch/sway setup when you're bumping against the limits.
2012 Jay Flight 29QBH
2003 Dodge Ram 2500 Cummins H.O. 48RE
Equalizer 4-pt sway control hitch
Prodigy P2 brake controller
2006 Jayfeather 29Y (past Jayco :))