Actually, some early 03s [mine for example] came with the Amana frig option but only 4 house bats. 4 house bats give you about 220 amp/hrs of useable power. Amana consumes about 2-3 AC amps [more during defrost]; thats 20-30 DC amps; your inverter is only about 80 percent efficient and consumes power all night just to make itself "hum". So for 8-10 hours, you are drawing about 160 to 300 amps/hrs [depending on weather/temps, frig doesnt run continuously].
Our only experience with dry camping is at Quartzsite in the January--cool overnight temps. Our 6 house bat keep the frig and propane furnance [set low] running all night but it does draw down bats. The 100 watts of OEM solar panels add little to the aforementioned consumption equation so while at Quartszite, we run our genset 2-3 hour at a time, twice a day. I think this charging scenario is pretty typical for dry camping.
Because of the 4 OEM bats, I had to get creative and weld up a cantiliver extension to the OEM bat rack so I could turn two of the existing bats length-ways to accommodate two new bats. Also, it may not be a problem if bats are relatively new [per yr earlier thread] but its generally not a good idea to add new bats to an existing bank of older bats.....
2003 40' MDTS
Garden Ridge, Texas