Propane Extend-A-Stay

When we launch our trial year of being full time RV'ers next year, we plan to stay at places like National Parks, Forests and other places in nature for upto two months at a time

We know our onboard propane tank isn't going to last that long, and following a little research I have been made aware of Extend-A-Stay rigs that allow you to connect an external regular camping propane tank to your RVs system. This would allow us to still have propane by driving our car to fill the regular camping tank rather than having to drive the whole darn RV to a filling station

My question to any of you that use this is how do you do it?

Do you:

1. connect the full camping propane tank to the main on board one (ours is towards the back on the passenger side) and leave it there connected (so it just feeds into the main tank all the time...)

Or..

2. Do you connect the camping tank and decant what you can into the RV's main propane tank every so often

With option 1 I'd be a tad concerned at someone potential stealing your spare tank and the hazard that might be caused by someone attempting to do it

How do any of you manage this issue

Chris