Remember, I'm a buff, not on the job, so consider my opinion with that in mind. That said,
1. The new (or relatively so) foam tankers each have 1500 gallon tanks; or taken together have twice the capacity of the foam tender; and are 12 years newer.
2. Why in the world would you purchase an exceptionally high volume pumper with a 1,000 gallon tank to replace a 3,000 gallon tanker with no pump?
Seems to me that the idea of buying the "super" pumper to replace the foam tender is, to put it mildly, and without meaning to insult anyone, dumber than dirt.