I will be the contrarian here. Modern bearings little maintenance is needed compared to days gone by. And I remember carrying a kit of tin snips and a couple of empty beer cans to make axle spindle shim bearings...on the side of the roads.
Number 1 on your list is inspect inside and outside for signs of grease seeping.
Buy a high quality grease. I use Mobil 1 or Green extreme duty waterproof. There are others.
Lifting or removing wheels is a big job, but you can "S L O W L Y" inject grease in all your wheels thru the Zerk fitting if you have one and then drive forward a full wheel turn and hit it again. If at either time the bearings took a lot of grease then back up and hit it again.
Seal blowouts are rare today as are leather and hard plastic seals. But any of them can be blown out if you hit it to hard and fast. The seals are made to allow old grease to come out under moderate pressure.
Tip. Wipe the head of your Zerk fittings to remove dirt before you grease.
Jack it up every other year and check for play by moving the tire back and forth. If have then you can tighten and hand grease or just replace the bearings.
If you replace bearings remember the old ax...good don't come cheap and cheap don't come good...
US Army Infantry, my rucksack was my RV
'16 Jayco Eagle HT 26.5 RKDS
'15 F 350 CC, LB Dually King Ranch