http://www.chron.com/sports/article/Law-requires-that-trailers-get-safety-inspections-6115851.php
Its not all of them, but still...
Looks like its a non issue for me, mine doesn't meet the requirements of needing an inspection. Taken from the article:
Texas law has for decades required annual safety inspection of trailers with a gross weight (weight of the trailer plus its carrying capacity or actual load) of more than 4,500 pounds
"It's pretty simple: As of March 1, to register a non-farm trailer that has a gross weight of 4,501 pounds or more, that trailer has to have a valid inspection," DMV's Southerland said.
Passing the annual safety inspection may prove a challenge for many trailers. Boat trailers, especially those used in highly corrosive saltwater, are notorious for having problems keeping lights operational. To pass the safety inspection, the trailer must have an operational brake system, tires and wheel assembly that meets requirements, and all lights - tail lights, brake lights, license plate light, side-marker lights and clearance lights - must be operational. Also, the trailer must have side and rear reflectors.