My trailer axles have grease fittings and the spindles are drilled to allow excess/old grease to be pushed out the back.
I guess repacking every 2k isn't bad unless you have more than one axle.
There's a company that sells a conversion kit to switch from grease to oil. They claim the bearings run cooler, last longer and of course there's no repacking. If my spindles weren't drilled I'd go with that type.
Can't find the name of this company. Will post address as soon as I find it.