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If unsure if a trailer is equipped with ABS, you can

A Check under the trailer for wheel speed sensors coming from the back of the brakes
Explaination
Trailers and converter dollies built on or after March 1, 1998 are required to have Anti-Lock Braking Systems (ABS). This will be indicated by the presence of a yellow malfunction lamp. You can determine if older trailers have ABS by checking under the trailers for ECU and wheel speed sensor wires coming from the back of the brakes.
B Try driving on a slippery surface and see if ABS kicks in
C Assume it does have ABS
D Remove a tire and look for the ABS sensor on the axle