I have a 19 foot trailer sailor (1986 O'Day 192). I want to put a new line and possible pendant on the swing keel and also inspect the bearing and shims. I would prefer to do it on land (I do not have scuba equipment). When the boat is on the trailer, the balasted keel that holds the swing keel rests on a 2X10. I assume that I will need to jack up the boat and pull the trailer out from under it in order to let the swing keel swing down.Has anyone done this or a similar procedure? The owner's brochure says that the boat has a displacement of less than 1500 lbs. This should be quite a simple procedure. However, I can forsee horrible problems if I do not think of something that could be obvious to someone else. For instance, how do I get the boat back on the trailer? Will the winch on the trailer simply pull the trailer back under the boat? How strong does the bracing under the boat have to be? Will carpenter saw horses fail under this weight? What would be good ways to Jack up the boat with out spending hundreds of dollars on fancy systems? What else have I not thought of?