Hello, I also needed to lube my camper's lift system as well. I just purchased a 2008 Rockwood Freedom 1640LTD. Campergal, those are referred to Zerk fittings. Yes, they are used to (normally) insert grease or the like into an area. My WDH also has them so I can lube the rotating bar holders. Normally, follow the manufacturer's instructions. Absent those, yes, normally fill until you see it coming out. Others may have specific instructions here. I gave my two zerk fitting about 8-10 squeezes of grease each from my gun.