Yes. Bumper-pull trailers get a tongue-style coupler lock, while gooseneck trailers need a lock built around the gooseneck coupler and latch.
It depends on the connection. King pin locks are for fifth-wheel pin boxes, and gooseneck coupler locks secure the ball-style gooseneck coupler. Proven makes both: the Model PL-5 king pin lock and separate gooseneck coupler models.
Coupler designs differ by brand. Model GDS is built for Demco couplers with the EZ Latch and won't fit Bulldog or RAM couplers, while Model GRB-78 fits Bulldog and RAM gooseneck couplers but not the Bulldog BX1.
A gooseneck coupler lock combined with a wheel boot: lock the connection point and the wheel separately.
Model GRSL-2530 is designed for RAM gooseneck couplers with self-latch. It fits round and square tubes and works with 25k and 30k rated versions.
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