OK, so I decided to see what kind of draws I am really seeing in my trailer so I got out the DMM and went to town. I was not able to measure the larger draws like slides and landing gear as I only had a meter rated to 10A DC. Here is what I found...
Standing Draw on system - .15A, propane leak detector, et al
1 Bulb Incandecent Fixture - 1.3A
2 Bulb Incandecent Fixture - 2.52A
All Lights on Kitchen Switch - 9.35A
Cheapy Bath Fan - 1.1A
Couch Lights (recessed style x2) - 1.67A
Dinette Light - 2.51A (essentially a 2 bulb incandecent fixture)
Fridge - On, Not Firing - .32A
Fridge - Firing - .37A
Furnace Fan - 7.75A
Radio - .33A
Range Hood Fan - .75A
Range Hood Light - .66A
Water Heater - On, not firing - .17A
Water Heater - Firing - .77
Water Pump - 5.85A
Test ran of single 12V house battery measuring 12.65V before and after tests. So in theory and not taking Peukert Effect into account, I could run the furnace alone for jsut over 28 hours before being down to 50% charge with my 2 220AH batteries.