As the title, does anyone have any experience with lube liners, as i am fed up with dirty grease on my fifth wheel!! 
Just out of curiousity, what grease are folks using, i have been using Morris graphite, is there anything better out there?
Used lube-liners since 1985, never regretted fitting one, but this only applies if you don’t swap trailers to often. If you use 6 trailers per day, they do wear and tear, but if you don’t swap too often they will last for 5 years minimum. The only thing is that you must remember to lubricate the jaws; either in the normal way, which defeats the object to some degree, or by putting a grease ■■■■■■and line into the jaws, some 5th wheels to have a tapping for this purpose, if not you will have to make one.