Obviously not on yours...
yes,they should do
Yes...no...yes...no...yes...no
sorry couldn't help it.
I take it they work on the vehicle you are using with no trailer plugged in. Do the indicators work on the trailer?
As others have said if working on motor should work on trailer, but tail boards can be a PITA if u've got a poor earth u sometimes get the side lights flashing instead.
Always something up with my tail board