We'll be getting the hydraulic stabilizers removed next week, and once that's done, look at places to mount the sewer hose carrier.
I'd prefer to avoid drilling any holes, and will be looking for a hole-free mount.
One concern was if the carrier would hang so low that it could be hit when we back in for parking. The HWH leveling jacks are low enough to be a concern when backing up to a curb - and don't want to do anything that would make it even harder to back into a parking space (if a pull through isn't available).
Right now, I have two plastic storage bins for the sewer hose parts in the driver side compartment under the slideout - one for the long hose plus the elbow and funnel. The other has the black water flush hose and a sewer hose extension plus sewer connector tools. I'm most concerned about the container with the sewer hose we use for most dumping - and if I can store that in a carrier underneath, could get rid of that container completely.
Will be my next project after the stabilizers are removed (and we get our lithium batteries!).