Ford f-650 2013 Owner's Manual page 26

Vehicle Inspection Guide
Trailer
If you are pulling a trailer, an inspection of the trailer similar to that of
the tractor should be done. The inspection should follow trailer
manufacturer recommendations and should include at a minimum:
general condition, landing gear, doors, sides, lights, reflectors,
suspension, brakes, tires, wheels, cargo placement, stability and
tie-downs.
Transmission
WARNING: If the unit starts in gear and/or the neutral start
switch is not functioning correctly, the vehicle may inadvertently
move which could result in property damage, personal injury or death.
If your vehicle is equipped with an automatic transmission, regularly
inspect the transmission's neutral start switch. The engine should only
start in position N or P.
Inspect the transmission fluid level and shift linkage for proper
operation.
2013 F-650/750 (f67)
Owners Guide gf, 1st Printing, October 2012
USA (fus)
25