Maybe this has been asked before, elsewhere, but is there a difference between "behøve" and "trenge"?
When the meaning of 'å trenge' is 'to need', the two are interchangeable. 'Trenger' is undoubtedly more common.
My native-English-speaking gut reaction is that "behøver" must be related to "behoove", and has a shade of meaning like, "I really ought to," rather than, "I must." Please destroy this notion if it's totally wrong. :)