Cluster Virtualmin?

I have a couple of physical servers and would like to deploy Webmin/Virtualmin on them, but would like them to essentially be mirrors of each other for improved reliability. One of my physical servers is a beast, and would be fine hosting multiple VMs, while the other server is older but still capable of handling websites, email, MySQL, Bind, and such.

I prefer to use Ubuntu and am comfortable using NFS if that would be helpful.

If there is already documentation somewhere on how to achieve this, I’ve been unable to find it. Can anyone point me in the right direction?