Some one on my other site www.irv2.com
(RV site) had brought this up about a year ago. I think it is very great idea. Some questions which they did not seem to have a answer for on the site is "How long does it take to cycle?" and "How soon can some come in behind you to use the toilet?"
The other thing I would wonder about is if there is no smell right from the start of the process. If your vented towards your camping neighbor his he going to get some smell at the start of the process.
2003 28' Show Hauler Motorhome on a 1995 FL 120 completely refurbished chassis. Currently in production - scheduled completion 1/10/03 www.showhauler.com