Crumm
Fordoholic
As long as the trailer has good brakes I would pull it. I would not recommend a bunch of power upgrades as then your transmission will suffer but a couple of thousand pounds over the tow rating is nothing to stress over in my opinion but keep in mind that I am running 2000-3000# over my GVWR without a trailer I am under my GCWR when hooked to my boat or wells cargo though. I cannot imagine a fifth wheel toy hauler not having brakes.