Truckmount Advice

Hello everyone, I'm looking into starting a new company.  I've worked with major carpet cleaning company for years and think it's time to branch out.  I'm wanting to get a truckmount system but don't have as much knowledge of them, except for the units we use in my current company.  Anyone have any suggestions on model or type?  Or even where to purchase one?

The company I work for manufactures their own cleaning engines.  We are a big national company.  So, I really don't have much knowledge of other machines out there.  The machine we use is a Kubota engine.

I'm wanting to do commercial and residential work as well as water extractions since I am certified in everything having to do with those.  I plan on buying a used van for this but I want a new cleaning engine for sure.  If anyone has any engines they have used or are currently using that can do all of these then please let me know...or any to avoid completely...