As full timers, one of the biggest gripes is running out of propane when it is cold outside
A lot of people use the "Extend-a-stay" solution with external tanks, which is great except when you run out in the middle of the night. Really, who wants to climb out of their warm, cozy bed to go outside in the middle of the night to switch over to their main "House" tank or a second external tank.
Solution! A slightly different setup than this mod for towables:
RV Propane Tank Changeover Indicator | ModMyRV
Basically, you do the same thing, however, you have to replace your existing regulator that is attached to your coach tank with the Marshall two stage model 254.
By doing this, you essentially have made your own extend-a-stay that automatically switches over from external tank to coach tank and lights up the indicator light to let you know.
Currently have this set-up on my Newmar Mountainaire and it works great.
Any questions, feel free to ask.