Hi Shorty,
I thought I would wait for a few others to post and then add my 2 cents worth. I have owned numerous truck mounts and had RX 20s running on them as well as Cimex equipment.
I also understand getting older and wanting lighter equipment and using the consumer's power and on & on.....
If you simply use the cleaning steps, and focus on the soil suspension ability you have with the Cimex by power agitation, (in my opinion with the use of brushes particularly in residential applications) and then follow up with the flushing of the SD, you will have excellent results. I also believe the chemistry has a lot to do with the results as well.
I am not talking theory or guess work, this is how I actively clean today and have as good of results as I ever did with truck mounts, at least in my own mind. I look at it that I can use raw power and get results or I can use a combination of cleaning principles and get to the same basic place.
The Cimex is just great for agitation, lifting the nap of the carpet, opening up the matted and crushed areas and even helping to pull up ground in soil. Then the flushing is all that is needed when the soil is properly suspended.
I have gone to using a 15 inch Cimex and the SD, which allows me to carry them in my little car when needed as well as my pile lifter and vacuum. Talk about economy, 30 plus miles per gallon, using the consumer's electricity and still having the ability to perform excellent results.
This may not be for everyone but for what you describe you want to accomplish and what you explained about equipment, this would seem to be a great set up. Again, this is not theory from my side but what I am actually doing. I have been cleaning this way with the SD for the last 7 years. I cleaned with TM's and Cimex for 25 years in combination as well as RX 20's. I am very comfortable cleaning with the Cimex and SD today.
I try real hard to clean, 'Clean Carpet' not because I can't clean dirty trashed out carpet, I just prefer this type of clientele. I sometimes get stuck with the rough and dirty carpet or some commercial carpet and I know I can get the needed results. I just prefer the cleaner, nicer carpets to work on.
Maybe we can set up something when you get here in Sept. I will see if we can find some good example of a carpet to compare the use of a combination of the Cimex and SD to compare with a TM and RX. The location we will be should have all of that there, we will just need to have some carpet to work on to compare with.
Hope this helps a little, I know it will seem a little biased but it is just my opinion.
Take care Shorty and I hope you wind up with what you really want and what will work for your situation.
Steve