Is it OK to travel with the jacks not stowed?

My '89 Bijou camper has Titan manual jacks and brackets so they can be swung up and stowed horizontally when not in use. Is it necessary? As long as the bottom of the jacks aren't lower than the truck frame I don't see why I can't leave them vertical when I am on the move, it would make setting up a breeze since I want to lower the jacks to steady the camper when we are parked.
Thanks for any comments.