Andy, slightly off topic but:
I love my mytee (do not recall the model) it is has a 12-13 gallon solution tank and a 10 gallon recovery tank. 2, 2 stage vacs and a 100 psi pump.
It is light enough to lift in/out of the van and pull upstairs. Easier than a buffer. And, I only use it now and again. so the bucket brigade is hardly ever an issue.
I put it in the bathroom closest to the room(s) I need and fill/dump. I then roll it closer if I need to. I prescrub so no heat is needed and I use ver little after so a post bonnet is all I need for that room/are to be dry often before many of the VLM rooms are.
They are cheap, easy to work on and work very well for urine etc.
In fact, if I did this full time and wanted to grow, it is the method I'd use and get away from the expensive o2 chemicals just for profit margin.
.02