Hooking into a 100 pound Propane tank

I would like to store my Bighorn in my 30x50 steel building this winter in Colorado. I would like to avoid winterizing... come and go several times over the winter. Is the following a practical option?

I would like to leave the thermostat at about 40. I would like to get a large tank and hook it up outside the RV. I have a neighbor that can check on it from time to time and swap out when needed.

What are the considerations for doing this? Is it safe?

thanks.