What is the best bearing grease? My Dexter manual says to grease bearings every 12 months or 12K miles. They spec. NLGI NO. 2 grease. Is anybody using synthetic grease? Since I only travel once a year for 6 to 8 weeks and about 4K miles,if synthetic grease is so great, maybe I could get by with changing lube every 2 years. Would like to hear your opinions. Thanks.