: Also, Get a Spare tire, it's cheap insurance.

A spare tire alone is pretty useless as few places are set up to work on tires of that size, so getting it mounted on your rim is going to be difficult. Get a tire that is already mounted on a wheel rim and ready to go. There are simple brackets which attach the spare to the trailer's tongue. If that is out of your price range, shop around for a tire tube of the proper size. (might not be easy to find) These trailers have tubeless tires, but in a pinch you can pull out whatever gave you the flat, and poke in an innertube You'll need to remove the valve from the tubelss tire so you can lead the innertube's filler valve out that hole. You can fill an innertube with a bicycle pump, but trying to reseat a tubeless tire with a bicycle pump is not very easy.

If you are going to be in the middle of nowhere for extended periods, it wouldn't hurt to carry a spare lug nut or bolt, along with spare bulbs. On second thought, in the middle of nowhere who is going to be around looking at your turn signals?

PGJ