Much bigger spars have been left up.
In February or March 1979 there was a wicked gale through the Mid-Atlantic region blowing about 60-70 mph. Not much snow, but it howled like a son of a gun for about two days. During the whole time our Raider 33 'Antigone' was precariously blocked up by a maniacal ex-tugboat captain/yard owner, sitting with the foot of the 6-ft-deep keel about 2 ft off the gravel at the yard and the whole 50-ft stick in place. I even think the boom was on it. I remember asking, 'Dad, do you think we should do something about the boat?'To which he replied (not even looking up), 'Naah.'Of course nothing happened. With some of this stuff worry is counterproductive.A boat on a trailer is going to rock for the simple fact that there is air in the tyres! LOL I mean, really! If you are concerned, block up the corners of the trailer. If the driveway is slanted ALWAYS chock the wheels. When you raise the mast make sure the rigging is at least safety-tight-- looser, and it will definitely give the mast a chance to gain momentum.The greatest worry I would have is for someone thinking he can move it 'just a little' in proximity to overhead wires, etc. But so far as getting the spar out of the way there is a simpler answer-- take it off the boat completely. Some spars can be cumbersome but even a 40-ft stick can be carried by 3 guys. I would prefer a cradle or trailer with a rack alongside for the spars anyway. You could make one out of plywood shapes U-bolted onto the frame. In some cases this is good enough to do maintenance and repair on the mast whilst it sits there and it definitely helps to have a neat litle package when transporting the boat. Truck drivers hate having to pack up spars in addition to the boat.JC