Never needed more tha 2 tanks.
Unless you are planning on going a month without a propane refill you will never run through 2 tanks. If you are camping in the winter time and have access to power the do two things: get a couple of electric space heaters and get a large (able to handle) propane and a hose extension to connect to it.
Propane fridges use very little propane, ovens even less (not on all the time), BUT furnaces are thirsty.
2018 Rockwood 2509S Mini Lite
Past: 1984 Road Ranger 20', 1988 Kit Companion
1984 Starcraft 24 foot popup
TV: 1999 Dodge 2500 Cummins 4x4
Honda EU2000i Generator, 200 Watts Solar
Ham Callsign KD7UM