Just curious. I put Ride-On in mine, and did not want to hear of a flat with it in there. I also carry a Stop-N-Go tire plugger and a compressor. I have considered a spare, and carry one on my tent camper, but I hate to give up the space and the weight. I hope you can get a bearing, and be back on the road soon.
Just a reminder to all, that there is a maintenance schedule for the trailer, too. Although the schedule calls for greasing the bearings every 12,000 miles, this is hard to track. I suggest doing it at the beginning of every riding season. The bearings and seals can be inspected and replaced (if necessary) at that time.