One of the best things I did to my trailer was swap over to LED lights. Never had a problem after that.
My belief is most of the trailer lighting issues come from a bad ground. Well I started thinking, you need more voltage to power an incandescent bulb, so any corrosion or inhibition in the ground could potentially restrict the circuit, thus the lights don't come on.
Well what if you had a light that didn't draw near the amperage and could function on much less voltage? some corrosion in the ground wire wouldn't be that big of a deal. Swapped them over with a $25 set from Amazon and haven't had one problem.
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Amazon product )
It could also be because they are kind of sealed? IDK, all I know is I am super happy with them. When this set screws up Ill just buy a complete other set.
Good on you for taking the bull by the horns with preventative maintenance, Wayne at West Coast is a great dude and stands behind everything he does.
I would most certainly learn how to do your bearings yourself at some point in the off chance you are stranded somewhere, and its good to know what all the pieces of the pie do.
Here is a great video of how to do a non-brake axle. (idle axle)
The only difference between that video and doing a brake axle is the caliper has to come off because the hub/rotor are typically one piece. Those two bolts that hold the caliper to the axle can really be a nightmare to get off, I carry a cheater bar in my truck tool box just for this reason.