Freeing Vehicle From Sand, Etc - GMC 1977 motorhome Operating Manual

Disconnecting Height
Control Valve
Link
Towing Vehicle
6 4
the left of driver) is moved to "HOLD" position,
thereby making the automatic height valves in-
operative on the rear suspension . On vehicles not
equipped with the optional Electro-Level Sys-
tem, it will be necessary to disconnect the height
control valve link at the rear suspension control
arm (adjacent to the shock absorber stud) on
each side of the vehicle. Raising front of vehicle
so front wheels are four inches off the ground will
provide about five-inch ground clearance at the
rear when towing .
TOWING AT REAR
It is not recommended that vehicle be towed
with the rear raised as this could result in sus-
pension or crossmember damage.
FREEING VEHICLE FROM SAND, ETC .
If it becomes necessary to rock the Motor-
home to free it from sand, mud, or snow, move
the transmission selector lever from "D" to "R"