I certainly hate to talk about weights. But this Flagstaff V is a weird floorplan. The hitch weight is 840 lb dry. Add usual propane, batteries, storage content, stuff in bathroom, bedroom, most stuff in the kitchen, water tanks... everything will add to hitch weight, nothing will balance it from the rear. I bet your F150 is overloaded big time.
Gene//////'16 Passport 2670 BH
'11 Mercedes ML 350 gas, Reinforced OEM hitch receiver,1000 lb Eaz-Lift with custom welded head, 2 sway control bars, P2, tst 507 trailer TPMS