Well, according to NADA guides, Duranautic stopped making boats in 1990.
So I suspect the boat and trailer are not 1996 models.
Looks like the 198x version of the boat was about 410#, plus motor and gear.
Is the tongue welded on, or bolted?
If bolted, consider removing it and turning it over so the bend is reversed, then use it but keep and eye on it.
Or replace the tongue.