Changes

*trailer (hook, no weight transfer)

*spreader (removes the pitch degree of freedom, typical of a spreader/booster/stinger on a lowboy configuration)

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|axle_model

|''For trailer usage only.'' Path to the axle model collision descriptors (.pmc). ''Added in 1.50.''

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|array<string>

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Expected sound event names are: air_brake, air_cutoff, reverse, lift_axle, hook_attach, hook_detach, and trailer_cables.

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|lamp_setup