I get one in VIRGINIA from a regular STATE INSPECTION location. They check the lights and look at the BRAKE PADS on one wheel. My yearly INSPECTION STICKER is placed on the DRIVERs SIDE of the Trailer Tongue area.
One visit they did the PULL the Trailer Emergency Disconnect PIN and made sure the electric brake locked up the wheel they had jacked up inspeting the BRAKE PAD.
I have always towed my trailer to the inspection station but have noticed some will drop their trailer off and come back later to pick it up.
Have no idea how things get inspected without the tow vehicle present????
One of our local RV DEALERS is also a INSPECTION STATION for RV's...