I have stabilizer jacks on my 2012 Serenity which have become quite noisy when extending and retracting them. They are obviously in need of lubrication, but since I can't fit under the vehicle to service them myself, I'm thinking about having the Mercedes dealership do it when it is on the hoist for its next service. Has anyone had this done? What is the recommended lubricant? I can't find any reference to this in the owner's manual. Any help would be appreciated. Thanks.