It's a little different for commercial trailers here in the original "Seccession State" (they're slightly more strict with commercial units) but for the average Joe hauling his boat or car around, not only do we have no license plate on the trailer, we also have zero inspections, safety or otherwise, for anything - cars, trucks, trailers, tires, windshields....nothing.
Gets a little scary, doesn't it?
If we haul our trailers out of state, then it is "recommended" that we get a "permanent" plate for it (they charge $47 once and forever). Some other states let us go through w/o plates, some don't. I made it to Massachusetts and back once without mine (forgot to put it on) and no one ever noticed.
On the safety stuff that Larry mentioned, it all just makes sense. If you want to risk losing your treasure, then go ahead and use edge-torn tie-down straps, forget the safety chains and don't bother with a positive-attach catch chain.
If, on the other hand, you want to take off, once properly loaded, and never worry about your load, other than occasionally checking the tie-downs for tightness, then do it right and follow Larry's guidelines.
I trailer Pearl about 5,000 miles each year, use good, chassis-crossed tie-downs (and I'm about to replace a couple for edge tears), have a catch chain and trailer safety chains (crossed under the trailer tongue) and ALWAYS check my trailer brakes before I take off. The only thing I don't have is a safety device to lock my trailer brakes if I disconnect. I would need a trailer battery to do that (which might also power my winch - hmmmmmmm.....might be a good idea after all!) Once I take off I have enough to do just to drive all day and not have to worry about whether the car will fall off the trailer somewhere. and I don't dog-it either - set the cruise at 70 and the diesel will hold it - even up through the Appalacian mountains (ask Nolan!)
Speaking of which, somewhere between Carlisle and Massachusetts is what's left of one of my trailer ramps that Chris and I lost a couple of years ago. Don't know where it is, just that it didn't arrive home when we did. NOW I even have safety chains for the stupid ramps.
Live and learn......
gn
hmmmmmmm.......aluminum foil on the ball, huh? Gotta try that one to get from a 2" up to my 2-5/16" socket!!!!! ;>)