I agree with fjray. You are right to be cautious. The hitch and coupler will not give you any trouble at all. What CAN give you trouble is the constant bouncing up and down and the impact it has on the trailer tongue. Minimize added weight on the tongue. Think about the bending forces in the tongue between the hitch and trailer axle caused by loads on the tongue. Don't put anything fragile in a tongue box, pay attention to how much weight is in the box, don't use a too thin metal for the tongue, and you'll be OK.
Here are pics of my trailer tongue that cracked about 85% of the way around the square tube. This was caused by the constant bouncing of the hitch coupled with the weight of the trailer body and tongue box at about the mid point of the tongue along with the fact the tube steel was too thin. It is 0.060". I had a guy weld plates over the crack and I inserted a heavier tube inside. I'm not worried about it breaking again!
Bottom side.
View attachment 161320
Left side.
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Right side.
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Top side.
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What's puzzling is the fact the top side, which you would expect to be in compression is broken completely while the bottom side, which would be tension you'd think, is not completely broken. Maybe welding on the top side caused it to break first.
I also had to change out the S hooks on the safety chains for carabiner type hooks because the chains would jump loose from the hitch safety chain hook holes.