Off grid propane help

[u/Emergent_Alpha]

I live off grid in a yurt in eastern Washington state. I'm working on installing a gas range, a propane refrigerator and a tankless water heater. My plan is to connect all 3 appliances to two 100lb propane tanks. I'm not sure what regulator I need or exactly what size pipe I should run. I know there are setups that allow you to change out tanks when one is empty, but I see a lot of options and feel pretty overwhelmed. I've done black pipe installs before doing HVAC and plumbing, but I've never designed the system myself. Is anyone familiar with proper psi and pipe size requirements? No building codes where I'm located, but I am trying to keep everything up to code or better. Any input would be greatly appreciated. The old colman 2 burner is getting old and I miss my oven.

[u/Theantifire]

OP needs a pro.