Bob, I'd leave the heater.

My rear heater core failed last year and I drove it around for the summer
with no heater (capped off the intake and outflow hoses) and picked up a
new core on one of my trips to a large city. (new core was $55)

 I really debated on whether or not to put one in, since I, too, don't
carry passengers and camp alone (or with Cat, and he wears his little fur
pantsuit outfit.)  But now that it's in I'm so glad it's there.  It's nice
to be able to warm up the back of the rig without frying me at the front.

Why warm up the back when I'm in the front?  Condensation/moisture buildup
in the back of the van...and eventual rust.  I live in a dry climate, but
the windows can still get foggy inside in winter, and it's nice to be able
to take the dew off the van and my gear.

--Patrice
85GL "VanaBlue"