I change the gear oil in the lower unit,fog the engine(spray fogging oil into the carbs until engine starts billowing smoke and engine will be bogging),then remove spark plugs and spray some fogging oil in the cylinders. Then I lube all fittings and spray WD40 on engine and linkage(under the engine cover that is). I also add stabilizer to the fuel tank. Then I jack up the trailer and remove the wheels and if I feel ambitious,I repack the wheel bearings. I've always done it myself and never had any problems. Good luck.
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