See also:

Clearing the programmed information
Individual buttons cannot be cleared. However, to clear all programming, press and hold the two outside buttons and release when the indicator light begins to flash (approximately 20 seconds). ...

Maximum load limits
Never allow the total trailer load to exceed the value specified in the following Towing Load/Specification Chart found later in this section. The total trailer load equals trailer weight plus i ...

Ventilators
Side ventilators Side ventilators Open or close, and adjust the air flow direction of ventilators as illustrated. ...