When I installed a Propex, I found room enough to mount the stock heater (upside down) on a simple bracket, just above the Propex.  Very minor trimming of plastic was required to fit beneath the folding seat/bed, and virtually no horizontal space was lost.

>.. what are the pros and cons of leaving the rear heater
connected, in an installation that has a Propex heater also installed under
the rear bench seat?=C2=A0 I like the idea of some redundancy in having two
heat sources.
I guess the main argument is the space that would be
required for the Propex, and the decrease in storage space.
What other issues should I consider? ..<