I am looking at a ranger 23 that I am interested in buying. It comes with a trailer that I would be wanting to store the boat on for the off season. It has what I think are called screw jacks, basically flat pieces of wood, on pivots mounted on poles from the frame. There are four of them. My question is, are four places sufficient to support the boat while on the trailer? Will that be safe while traveling at freeway speeds? Will it cause any damage to the hull if it is stored on the trailer for 4 to 6 months out of the year? I have not seen the boat on the trailer yet, so is it supposed to rest on its keel on most trailers of this type? Also how difficult is it to launch off this type of trailer? On a side note, any tips of stepping and unstepping the mast on a ranger 23 are greatly appreciated.