propane tank

Undo whatever you have to to remove the tank from the pod after you turn off the valve on top of the tank and unscrew the hose from the tank.

As for the tank swap places, I agree with Jato and GlueGuy to a point.  The people selling those things don't give a hoot which tank they give you, so I always pick the best looking one I can see, so I usually get an upgrade.  And Jato is right, it does cost more for less.  Around here prices are considerably lower than in Michigan.  Where I diagree a bit is that especially while travelling, I won't hesitate much to pay a little more for a tank swap.  Even if it costs $10 more, my time on vacation is worth more than driving around very much for a refill place. 

TT

Stephen, what brand tank do you have?  Been looking at the tanks from Camping World with the gauge built right into the value.  I wouldn't bet my life on its accuracy, but it gets you in the ballpark.
Thanks
Jeff
https://www.campingworld.com/refillable-steel-propane-cylinder-20-lb-47-gal-with-gas-gauge

Got it---you gave me incentive to look again--thanks mjlrpod and thebum---

Check out these products: www.mopeka.com/products

Mine works extremely well and can be moved from one tank to another (magnetic attachment to bottom of cylinder).

You are correct glueguy, I do attach, detach using the internal threads and they are indeed left handed.  Maybe because our pod is from 2011 the end of the line is maybe different from the newer models.