When you could get the treatments that had formaldehyde (like Thetford Campa Chem) we used them part of the time. Usually last dose of a trip. These worked pretty well. Ones without formaldehyde don't work very well and we don't usually use any of...
He may be able to fix this by using a higher hitch ball. I personally am leary of the straps lasting very long, especially if used with heavy trailers that have over 1,000 lbs. of hitch weight.
I used to worry about what kind of RV antifreeze to use too. I got mine from Atwoods or Orschelns usually. Don't remember the brand but it did not contain alcohol. The last 8 or 10 years I have been blowing the system out with air and not worrying...
