FORD 2007 F-550 v.2 - Manual (Page 207)

Do not spin the wheels at over 35 mph (55 km/h). The tires may
fail and injure a passenger or bystander.
Removing the snowplow frame mount
A metal crossmember is included below the front bumper on Super Duty
vehicles called a “BlockerBeam”. Typical snowplow installations require
removal of this BlockerBeam to install the snowplow mounting hardware
to the vehicle frame.
The BlockerBeam must be re-installed if the snowplow
frame-mounting hardware is removed from the vehicle to ensure
proper airbag deployment in a crash.
2007 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)
Driving
207