Personal Watercraft Insurance, Trailers they can ruin your day in a hurry
Inspect the tires, and rims. Check the bearings the lug nuts and the springs. Check the frame and the rollers or skids or both, depending on what your trailer uses.
Do you have a spare tire and wheel, spare hub and bearings, grease, tools, a good jack and a tire iron that will fit on your lugs. Check your wires and lights, and the condition of the coupler and trailer hitch, plus the safety chains.