There are different versions of that drum I think. What bearing size is it exactly may help people?
We just put 3rd set of "sealed for life" bearings in a just turned 5 year old SBS trailer few weeks ago. Compact alko 2051 hubs and used these at 1/4 ish the cost.
https://www.ebay.co.uk/itm/162839541763.
The compact 2051 is AL-KO part no. 605124 Bearing size: ID=34mm., OD=64mm., H=37mm.
The OEM bearings last about 18 months then start to rumble slightly, I can't hear it but lad can and when you take them apart they are shot right enough. That's why he just buys these now and change them out. Always replace the caps and one shot nuts at same time if anyone doing it. HTH someone