I think that both the knob/lock and the deadbolt are standard household units - the fact that it is a trailer does not require anything special. Like a household unit, the deadbolt is mounted just above the knob, and the bolt recess cut/bored into the door frame (which is aluminum).
Given that it is standard, you should be able to get a keyless unit as well as a standard keyed unit. Sorry I have no pictures, but my TM is not here.
Bill
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