just wondering who here has changed over to bigger LP tanks? I already have a couple of 20# propane tanks on the front of my Flagstaff. auto transferring set up is nice for a weekend incase I run low on saturday night but for running weeks at a time in cool to cold climates has anyone adapted to bigger tanks.how long do they last you under what conditions, at what temperature inside. are the outside temps. consistent or do they vary a lot. any help would be appreciated. all opinions gratefully accepted.