Go to a scale and have the trailer weighed. Hitch balls do have weight ratings, so be safe. Make sure your hitch is rated well too. Having an accurate weight will insure you are not overloading your tow vehicle. Be sure the hitch ball is torqued properly, preferably with a long pipe wrench, and then a couple tack welds on the nut to be safe. I had a friend lose a trailer because the ball wasn't tight. I have had a couple loosen up on me too.
A good sway control is very cheap, usually around $100. It will keep you safe in cross winds, a good investment even for the lightest trailers.
Depending on what you tow with, you may consider a load distributing hitch. It will keep your vehicle level, help the steering and steering geometry, and keep the brakes on an even keel.
I tow 10000 pounds, so all of this was mandatory for me.
Dual safety chains are best, and should be crossed into and X, right to left, left to right. The safety chain rating is important, so is the attachment points, as well as the hardware you use to attach the chains......only as strong as the weakest link.
Definately spend time on these things now, and you won't have to give it another thought down the road.
Look at them tires too. If they have dry rot, and/or are around 7+ years old, guess what will happen at freeway speeds on a hot day? Yeah, I overlooked this one. Glad I had a spare and a jack.