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If you are going to put any kind of load on them I'd DX that strap idea.
Bolt them together with Grade 8 bolts and be redundant on the steel connectors.
Putting the general public at risk to save a few bucks is a non-starter.
This is just an exercise in "what if" (if your Aunt Freida had balls she'd be your Uncle Fred) but what if you joined the two trailers together so that they pulled like one twin axle?
Maybe join them together with two pices of metal bolted to both trailers that could be removed when you got...