I assume E-21 is a finger typo? Maybe I've missed a new modification? I trailor my R-21 all the time. I just try to remember to make sure I position the light correctly by operating it thru its range to the safe side. Winterizing- easier still, there is only one spring loaded pin holding the two hinge points and the whole assembly on the structure fwd when you fold. Befor rotating the plastic nuts off the mast, disconnect electrical plug, fold mast and pull the one safety pin that prevents the hingepins from sliding to port. You can slide off the mast sideways in seconds and its done. Store anywhere, its not gonna wear a hole in your cover by buffetting in the wind. Good luck.