Use both. A coupler lock stops hitching, and a wheel boot stops rolling.
The WB-300 is designed for trailer rims and ST tires on standard factory steel rims. If your trailer has LT or passenger tires, contact support before ordering, as you may have fitment issues.
Immobilizing a wheel stops a parked trailer from being rolled away. It works separately from locking the coupler.
The WB-300 is a wheel boot for single- and tandem-axle trailers with brakes. The WL-200 is for leaf-spring trailers without brakes and won't work with torsion axles.
A coupler lock plus a wheel lock, so the trailer can't be hitched or rolled.
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