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Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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A few comments-
Stub axles see far higher bending forces than axles supported at both ends, way higher.
Do make sure the increased trailer height (with the 4" larger diameter tires changing the hitch geometry) won't change how the handling works.
Consider sourcing wheel chair hubs, hubs from already made trailers or jogging strollers.
Consider making your own hubs with cartridge bearings.
How much load does the trailer carry? You mention the strength of the rims as being a problem? What width tires are you using?
Traditional bike parts have only so much strength/capacity/application ease all driven by the profit wanted nature of business. When one uses them in different ways than intended, all kinds of issues can develop. Andy
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AndrewRStewart