This may have been covered before but I can’t find it. I drive a truck for a living and grease my 5th wheel at least once a month. I’ve also have been looking at other folks that have a 5er and haven’...
In the beginning we used red chassis grease on the hitch top plate. Then the white plastic nylon disc became available so no more grease stained clothes/hands.
Make sure your hitch mfg recommends using one.
You'll see some 5th wheel rv trailer owners use nothing or some type of spray on lube. My 11400 lb 5er has around 2200-2400 lbs on the plate ...nothing like the load your OTR rigs top plate carries ...or the miles per year of use.