I took the 10 16bit 44.1khz wav files in the Realdrums folder and encoded them to 24bit 48khz multichannel wavepack file that injects directly into Reaper.
https://www.dropbox.com/s/vt2bg5l614g8nx7/BB-Wavepack-Multichannel-Drums.mp4?dl=0

See in pic below file size of the 10 16/44.1 drum stems and the file size of the single 10ch 24/48 wavepack file that's 100meg smaller.