I would also check your turn signal, brake lights, hazard flasher and running lights at the trailer. I would also check your air pressure in tires and lug nut torque.
I would also grease the king pin that the hitch jaws lock around.
Secure refrigerator contents with spring loaded tension bars and refrigerator door.
If equipped inflate to level indicated at arrow points for air ride hitch, inflate air bags for truck if equipped.
One more thing if equipped turn on inverter for residential refrigerator and secure.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67