Home of the Horse Trailer Blue Book
http://www.thehorse.com/ViewArticle.aspx?ID=13851
More of a reminder than anything else. Very interesting info.
Good info there, here's some more from "Dexter" and "AL-Ko"....
http://www.towmaster.com/pdf_manuals/Dexter_Maintenance_600-8000lb_axles.pdf
http://www.towmaster.com/pdf_manuals/Dexter_Maintenance_9000-15000lb_axles.pdf
http://www.pjtrailers.com/downloads/AL-KO_HD_Owners_Manual.pdf