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With the 100 watt DC/DC, you could assist an individual system (via the fuse panel) but would probably want to put a large diode (perhaps a 1N1206A) so the aux battery could power the items if the DC/DC were off/inop, and the DC/DC would not 'backfeed' the entire 12v bus through the fuse panel.
The diode will have some amount of loss, however.
With the 100 watt DC/DC, you can probably power about 7.5 amps. I use a 300 watt DC/DC to run my entire 12v bus, (also charges/maintains the 12v aux battery) but I don't have any 12v fans. With everything turned on, the 300watt DC/DC is just about maxed out.
I built a defroster out of a cheap *mart heater. I replaced the 115 vac fan with a 48v computer rack fan, and changed the resistive elements somewhat to make it work. I originally wanted a heater, but it works better as a defroster that is used from time to time. Depending on how your heater box is arranged, you could probably put the heater element inside and run it off the main pack - I hear that many conversions have that kind of setup to keep the defroster functionality.
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