Some of the tilt decks I've seen (and loaded on) have a cylinder, usuallly hydraulic one that has both ports connected together with a restricting device between the two ports, some decks you actually had to drive alomst to the point that the machine was going to go off the edge to get over center, then the deck comes down, but you can actually tip it and drive back down/up and have the cylinder hold it there.
But something always had to give on the cylinder, my Dad's old Miller tilt deck kept bending the cylinder rod when he got too carried away, good times, I still remember Dad cussing and swearing when it happened.......:Banghead