Has anyone else upgraded from a single 20 lbs. tank to double 20 lbs. tanks? I did, went pretty quick, easy and relatively inexpensive. I did have to notch the tank cover on the back side because of the weight distribution hitch latches and I'll probably notch the front too so it sits a little lower and sits evenly. Turning the power jack head helped and I'm going to break out the heat gun and use it to reform the middle of the tank cover so it slides on and off a little easier. I also added an auto change over but I'm not convinced it's working properly because it seems like it's pulling off both tanks evenly. So I need to dig a little deeper into that.
This is changeover I got
The double tank carrier
The whole project including turning the head on the jack stand, happy side note we can now open the lift gate on our SUV with the trailer attached we couldn't before, took about 30 minutes or so.