Grease gun/ grease recommendations

I use the EZ Lube feature every year. Never had a problem. I jack up the axle under the "U" bolt. Then I check/adjust the brakes, then I add a few squirts of grease till I see it pushing out of the front, while spinning the tire. Then on to the next axle. All four axles can be done in a half hour easy. I use the grease gun that I inherited from my grandfather. It's probably as old as I am.

Dexter video