On the sides of the support bows, near where the brackets hold them upright, there is more support for forward/reverse load stresses, so shouldn't be a major issue. Only issue I see is if you're doing it on both sides it might increase your overall width to above the legal limit.
On top might cause some additional stress, but short of emergency stops, extreme acceleration or severe terrain it shouldn't be an issue. I've seen very few trailers in the civilian world with the proper top brackets that would distribute the stress over all of the bow mounting brackets.
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