Inspection, Service & Maintenance 172 10.2.1.20 Ridewell Suspension with Lift Axle CAUTION DO NOT TOW LOADED TRAILER WHEN LIFT AXLE IS LIFTED, SERIOUS DAMAGE CAN OCCUR. Caution must be exercised when using lift axles. Damage to the trailer frame and/or axles can result from overloading by lifting an axle so that the distance from the coupler to the remaining axles suddenly increases. See Figure 4. When the front axle is lifted, the rear axle will take on the entire load, which could result in bending or causing other damage.
20071CB
To see the actual publication please follow the link above