I don't have trumpet vine, but I can say that for my Blanche Sandman honeysuckles, I've just today pruned back all the "dead" material on the ends of the vines so if that's what you're talking about "pruning" (the dried out, dead looking ends), I can't imagine any harm in cleaning things up. I waited until my honeysuckles had leafed out noticeably, then just worked back (snapping test branches to make sure I was still in "dead" material that snapped easily and was dry, with no green) until I got to a green leaf set. Then I cut right above them. I would assume you could do that with any flowering vine (clematis having their own obvious exceptions).

But to be certain, check out the vines forum...

Here is a link that might be useful: Great GW thread on pruning vines

Thanks CTLady
I did go prune it very late
just like you said.
It looks very good now.