The Proviso™ Plus P200ML system is designed for controlling the self-steering lift axle on SPIF 21 and 23 trucks, with walking beam and spring suspension. This includes lifting the axle in reverse, with the 4-way flashers, and when the truck is empty. The system also lowers the axle when the truck is loaded.
The P200ML also provides controls for locking the self-steering axle and a max load indicator.