Dropper seatpost and top tube converters

I've always lugged my 06 Reign around on a towbar mounted rack with a top tube converter. Today I switched out the seatpost for a Giant Contact dropper post - has anyone had any experience with dropper posts being ruined by top tube converters?

I assume the posts work really when used properly, ie, being sat on, but not sure whether they'll go as well being pulled the other way when in transit using a top tube converter.

FYI, I can manually pull the seatpost so it fully extends even when the trigger isn't pressed...there's no locking mechanism to stop it moving upwards.