At this point you might as well buy the lightest manual sliding hitch that will do the job such as a Curt and see how well your F150 handles it while you wait for your new truck.
I see you have 84 gals of gray tank. Looking at the floor layout I'm sure your tanks are forward of the axles. This is the killer for me. I'm WAY over my limits when the tanks are full. Either use full hookups or take it easy between the campsite and dump station.
Pack light and you may be surprised how well your truck handles this camper. You might want to add Timbrens to counter some of the sag.