Harold:

I don't have a Surepower; I inherited a battery switch
that works great--manually.

Regarding the Vitrifrigo:  I like more and more the
way I installed mine--on a couple of aluminum angle
rails.  Plus the drawer underneath.  Pix are at
http://jones.colorado.edu/VW/Vitrifrigo/
After almost a year of Syncro roads in Colorado and
Utah, it is still rock solid.

If you have questions, I'd be happy to help, but I'll
be off the list for a week starting tomorrow--with Bob.

BTW--Vitrifrigo owners:  I ran some tests of fridge and
freezer temps and posted them to a page on the above link.
I was running mine at 5:00 and wondered why it took so
long to make ice.  Now I know.

Richard