I’ve have had them on my 8×5 boxie/bike trailer for 8 years!
with out knowing the exact k’s
it would have to be close to 20/ 30,000
have only adjusted the bearings once,
trailer gets hooked on to car and dragged over everything that gets in its road!
Carts firewood every winter for 2 house holds (over 6 t)
i love them