Greetings & Welcome!
110ah per day is a LOT. In comparison, I use 40-50ah per WEEK.
An isolator needs to have a high enough capacity to cover your alternators output, but in the end, it’s your alternator that determines the charging capacity, not the isolator.
If your expected usage is accurate, I would suggest 300ah of lead acid deep cycle batteries. I get mine at junk yards for ~$20 each. My last one lasted over 7 years, with isolator charging only and no solar.
For 300ah of batteries, 600 watts of solar would be an absolute minimum because short winter days, or cloudy/rainy/snowy days severely limit the effectiveness of solar. I have a $99 gas inverter generator and a $29 battery charger for a backup plan instead of solar, and even with solar, I wouldn’t be caught dead without my generator. Depending on Mother Nature can be extremely problematic.
I also recommend that everybody should be set up to survive without any power. I have lights, heat, cooking, and refrigeration that are totally independent of my vans power system. Combined with the option of my generator, I feel pretty prepared. I have been totally snowed in for several weeks at a time, and was stranded for nearly a month when a bridge got washed out. Being prepared has it’s rewards… I try to keep at least a months worth of canned food on board at all times, including canned or smoked meats that don’t need refrigeration, then I always use the oldest, and replace them with newer when I go shopping. That way nothing ever ages out. You can even get canned bread. (I like B & M Brown Bread)
"Tis the season... To make bank selling Christmas Trees!" ~Van_Dweller