The trim does not seem to work on the 96 Challenger - Single 787 engine. Is it operated by just a cable or is it electical / servo operated. I heard about VTS but don't know what that is?
I am not sure, but was under the impression that VTS systems were on PWC's and not boats. Is there a trim button anywhere near the operators controls? You could also look at the jet nozzle and see if it can pivot up and down.